Like all modern cloud providers, Amazon adopts the shared responsibility model for cloud security. Amazon guarantees secure... AWS NACL best practices: How to combine security groups with network ACLs effectively Prof. Avishai Wool 2 min read Prof. Avishai Wool Short bio about author here Lorem ipsum dolor sit amet consectetur. Vitae donec tincidunt elementum quam laoreet duis sit enim. Duis mattis velit sit leo diam. Tags Share this article 8/28/23 Published Like all modern cloud providers, Amazon adopts the shared responsibility model for cloud security. Amazon guarantees secure infrastructure for Amazon Web Services, while AWS users are responsible for maintaining secure configurations. That requires using multiple AWS services and tools to manage traffic. You’ll need to develop a set of inbound rules for incoming connections between your Amazon Virtual Private Cloud (VPC) and all of its Elastic Compute (EC2) instances and the rest of the Internet. You’ll also need to manage outbound traffic with a series of outbound rules. Your Amazon VPC provides you with several tools to do this. The two most important ones are security groups and Network Access Control Lists (NACLs). Security groups are stateful firewalls that secure inbound traffic for individual EC2 instances. Network ACLs are stateless firewalls that secure inbound and outbound traffic for VPC subnets. Managing AWS VPC security requires configuring both of these tools appropriately for your unique security risk profile. This means planning your security architecture carefully to align it the rest of your security framework. For example, your firewall rules impact the way Amazon Identity Access Management (IAM) handles user permissions. Some (but not all) IAM features can be implemented at the network firewall layer of security. Before you can manage AWS network security effectively , you must familiarize yourself with how AWS security tools work and what sets them apart. Everything you need to know about security groups vs NACLs AWS security groups explained: Every AWS account has a single default security group assigned to the default VPC in every Region. It is configured to allow inbound traffic from network interfaces assigned to the same group, using any protocol and any port. It also allows all outbound traffic using any protocol and any port. Your default security group will also allow all outbound IPv6 traffic once your VPC is associated with an IPv6 CIDR block. You can’t delete the default security group, but you can create new security groups and assign them to AWS EC2 instances. Each security group can only contain up to 60 rules, but you can set up to 2500 security groups per Region. You can associate many different security groups to a single instance, potentially combining hundreds of rules. These are all allow rules that allow traffic to flow according the ports and protocols specified. For example, you might set up a rule that authorizes inbound traffic over IPv6 for linux SSH commands and sends it to a specific destination. This could be different from the destination you set for other TCP traffic. Security groups are stateful, which means that requests sent from your instance will be allowed to flow regardless of inbound traffic rules. Similarly, VPC security groups automatically responses to inbound traffic to flow out regardless of outbound rules. However, since security groups do not support deny rules, you can’t use them to block a specific IP address from connecting with your EC2 instance. Be aware that Amazon EC2 automatically blocks email traffic on port 25 by default – but this is not included as a specific rule in your default security group. AWS NACLs explained: Your VPC comes with a default NACL configured to automatically allow all inbound and outbound network traffic. Unlike security groups, NACLs filter traffic at the subnet level. That means that Network ACL rules apply to every EC2 instance in the subnet, allowing users to manage AWS resources more efficiently. Every subnet in your VPC must be associated with a Network ACL. Any single Network ACL can be associated with multiple subnets, but each subnet can only be assigned to one Network ACL at a time. Every rule has its own rule number, and Amazon evaluates rules in ascending order. The most important characteristic of NACL rules is that they can deny traffic. Amazon evaluates these rules when traffic enters or leaves the subnet – not while it moves within the subnet. You can access more granular data on data flows using VPC flow logs. Since Amazon evaluates NACL rules in ascending order, make sure that you place deny rules earlier in the table than rules that allow traffic to multiple ports. You will also have to create specific rules for IPv4 and IPv6 traffic – AWS treats these as two distinct types of traffic, so rules that apply to one do not automatically apply to the other. Once you start customizing NACLs, you will have to take into account the way they interact with other AWS services. For example, Elastic Load Balancing won’t work if your NACL contains a deny rule excluding traffic from 0.0.0.0/0 or the subnet’s CIDR. You should create specific inclusions for services like Elastic Load Balancing, AWS Lambda, and AWS CloudWatch. You may need to set up specific inclusions for third-party APIs, as well. You can create these inclusions by specifying ephemeral port ranges that correspond to the services you want to allow. For example, NAT gateways use ports 1024 to 65535. This is the same range covered by AWS Lambda functions, but it’s different than the range used by Windows operating systems. When creating these rules, remember that unlike security groups, NACLs are stateless. That means that when responses to allowed traffic are generated, those responses are subject to NACL rules. Misconfigured NACLs deny traffic responses that should be allowed, leading to errors, reduced visibility, and potential security vulnerabilities . How to configure and map NACL associations A major part of optimizing NACL architecture involves mapping the associations between security groups and NACLs. Ideally, you want to enforce a specific set of rules at the subnet level using NACLs, and a different set of instance-specific rules at the security group level. Keeping these rulesets separate will prevent you from setting inconsistent rules and accidentally causing unpredictable performance problems. The first step in mapping NACL associations is using the Amazon VPC console to find out which NACL is associated with a particular subnet. Since NACLs can be associated with multiple subnets, you will want to create a comprehensive list of every association and the rules they contain. To find out which NACL is associated with a subnet: Open the Amazon VPC console . Select Subnets in the navigation pane. Select the subnet you want to inspect. The Network ACL tab will display the ID of the ACL associated with that network, and the rules it contains. To find out which subnets are associated with a NACL: Open the Amazon VPC console . Select Network ACLS in the navigation pane. Click over to the column entitled Associated With. Select a Network ACL from the list. Look for Subnet associations on the details pane and click on it. The pane will show you all subnets associated with the selected Network ACL. Now that you know how the difference between security groups and NACLs and you can map the associations between your subnets and NACLs, you’re ready to implement some security best practices that will help you strengthen and simplify your network architecture. 5 best practices for AWS NACL management Pay close attention to default NACLs, especially at the beginning Since every VPC comes with a default NACL, many AWS users jump straight into configuring their VPC and creating subnets, leaving NACL configuration for later. The problem here is that every subnet associated with your VPC will inherit the default NACL. This allows all traffic to flow into and out of the network. Going back and building a working security policy framework will be difficult and complicated – especially if adjustments are still being made to your subnet-level architecture. Taking time to create custom NACLs and assign them to the appropriate subnets as you go will make it much easier to keep track of changes to your security posture as you modify your VPC moving forward. Implement a two-tiered system where NACLs and security groups complement one another Security groups and NACLs are designed to complement one another, yet not every AWS VPC user configures their security policies accordingly. Mapping out your assets can help you identify exactly what kind of rules need to be put in place, and may help you determine which tool is the best one for each particular case. For example, imagine you have a two-tiered web application with web servers in one security group and a database in another. You could establish inbound NACL rules that allow external connections to your web servers from anywhere in the world (enabling port 443 connections) while strictly limiting access to your database (by only allowing port 3306 connections for MySQL). Look out for ineffective, redundant, and misconfigured deny rules Amazon recommends placing deny rules first in the sequential list of rules that your NACL enforces. Since you’re likely to enforce multiple deny rules per NACL (and multiple NACLs throughout your VPC), you’ll want to pay close attention to the order of those rules, looking for conflicts and misconfigurations that will impact your security posture. Similarly, you should pay close attention to the way security group rules interact with your NACLs. Even misconfigurations that are harmless from a security perspective may end up impacting the performance of your instance, or causing other problems. Regularly reviewing your rules is a good way to prevent these mistakes from occurring. Limit outbound traffic to the required ports or port ranges When creating a new NACL, you have the ability to apply inbound or outbound restrictions. There may be cases where you want to set outbound rules that allow traffic from all ports. Be careful, though. This may introduce vulnerabilities into your security posture. It’s better to limit access to the required ports, or to specify the corresponding port range for outbound rules. This establishes the principle of least privilege to outbound traffic and limits the risk of unauthorized access that may occur at the subnet level. Test your security posture frequently and verify the results How do you know if your particular combination of security groups and NACLs is optimal? Testing your architecture is a vital step towards making sure you haven’t left out any glaring vulnerabilities. It also gives you a good opportunity to address misconfiguration risks. This doesn’t always mean actively running penetration tests with experienced red team consultants, although that’s a valuable way to ensure best-in-class security. It also means taking time to validate your rules by running small tests with an external device. Consider using AWS flow logs to trace the way your rules direct traffic and using that data to improve your work. How to diagnose security group rules and NACL rules with flow logs Flow logs allow you to verify whether your firewall rules follow security best practices effectively. You can follow data ingress and egress and observe how data interacts with your AWS security rule architecture at each step along the way. This gives you clear visibility into how efficient your route tables are, and may help you configure your internet gateways for optimal performance. Before you can use the Flow Log CLI, you will need to create an IAM role that includes a policy granting users the permission to create, configure, and delete flow logs. Flow logs are available at three distinct levels, each accessible through its own console: Network interfaces VPCs Subnets You can use the ping command from an external device to test the way your instance’s security group and NACLs interact. Your security group rules (which are stateful) will allow the response ping from your instance to go through. Your NACL rules (which are stateless) will not allow the outbound ping response to travel back to your device. You can look for this activity through a flow log query. Here is a quick tutorial on how to create a flow log query to check your AWS security policies. First you’ll need to create a flow log in the AWS CLI. This is an example of a flow log query that captures all rejected traffic for a specified network interface. It delivers the flow logs to a CloudWatch log group with permissions specified in the IAM role: aws ec2 create-flow-logs \ –resource-type NetworkInterface \ –resource-ids eni-1235b8ca123456789 \ –traffic-type ALL \ –log-group-name my-flow-logs \ –deliver-logs-permission-arn arn:aws:iam::123456789101:role/publishFlowLogs Assuming your test pings represent the only traffic flowing between your external device and EC2 instance, you’ll get two records that look like this: 2 123456789010 eni-1235b8ca123456789 203.0.113.12 172.31.16.139 0 0 1 4 336 1432917027 1432917142 ACCEPT OK 2 123456789010 eni-1235b8ca123456789 172.31.16.139 203.0.113.12 0 0 1 4 336 1432917094 1432917142 REJECT OK To parse this data, you’ll need to familiarize yourself with flow log syntax. Default flow log records contain 14 arguments, although you can also expand custom queries to return more than double that number: Version tells you the version currently in use. Default flow logs requests use Version 2. Expanded custom requests may use Version 3 or 4. Account-id tells you the account ID of the owner of the network interface that traffic is traveling through. The record may display as unknown if the network interface is part of an AWS service like a Network Load Balancer. Interface-id shows the unique ID of the network interface for the traffic currently under inspection. Srcaddr shows the source of incoming traffic, or the address of the network interface for outgoing traffic. In the case of IPv4 addresses for network interfaces, it is always its private IPv4 address. Dstaddr shows the destination of outgoing traffic, or the address of the network interface for incoming traffic. In the case of IPv4 addresses for network interfaces, it is always its private IPv4 address. Srcport is the source port for the traffic under inspection. Dstport is the destination port for the traffic under inspection. Protocol refers to the corresponding IANA traffic protocol number . Packets describes the number of packets transferred. Bytes describes the number of bytes transferred. Start shows the start time when the first data packet was received. This could be up to one minute after the network interface transmitted or received the packet. End shows the time when the last data packet was received. This can be up to one minutes after the network interface transmitted or received the data packet. Action describes what happened to the traffic under inspection: ACCEPT means that traffic was allowed to pass. REJECT means the traffic was blocked, typically by security groups or NACLs. Log-status confirms the status of the flow log: OK means data is logging normally. NODATA means no network traffic to or from the network interface was detected during the specified interval. SKIPDATA means some flow log records are missing, usually due to internal capacity restraints or other errors. Going back to the example above, the flow log output shows that a user sent a command from a device with the IP address 203.0.113.12 to the network interface’s private IP address, which is 172.31.16.139. The security group’s inbound rules allowed the ICMP traffic to travel through, producing an ACCEPT record. However, the NACL did not let the ping response go through, because it is stateless. This generated the REJECT record that followed immediately after. If you configure your NACL to permit output ICMP traffic and run this test again, the second flow log record will change to ACCEPT. azon Web Services (AWS) is one of the most popular options for organizations looking to migrate their business applications to the cloud. It’s easy to see why: AWS offers high capacity, scalable and cost-effective storage, and a flexible, shared responsibility approach to security. Essentially, AWS secures the infrastructure, and you secure whatever you run on that infrastructure. However, this model does throw up some challenges. What exactly do you have control over? How can you customize your AWS infrastructure so that it isn’t just secure today, but will continue delivering robust, easily managed security in the future? The basics: security groups AWS offers virtual firewalls to organizations, for filtering traffic that crosses their cloud network segments. The AWS firewalls are managed using a concept called Security Groups. These are the policies, or lists of security rules, applied to an instance – a virtualized computer in the AWS estate. AWS Security Groups are not identical to traditional firewalls, and they have some unique characteristics and functionality that you should be aware of, and we’ve discussed them in detail in video lesson 1: the fundamentals of AWS Security Groups , but the crucial points to be aware of are as follows. First, security groups do not deny traffic – that is, all the rules in security groups are positive, and allow traffic. Second, while security group rules can be set to specify a traffic source, or a destination, they cannot specify both on the same rule. This is because AWS always sets the unspecified side (source or destination) as the instance to which the group is applied. Finally, single security groups can be applied to multiple instances, or multiple security groups can be applied to a single instance: AWS is very flexible. This flexibility is one of the unique benefits of AWS, allowing organizations to build bespoke security policies across different functions and even operating systems, mixing and matching them to suit their needs. Adding Network ACLs into the mix To further enhance and enrich its security filtering capabilities AWS also offers a feature called Network Access Control Lists (NACLs). Like security groups, each NACL is a list of rules, but there are two important differences between NACLs and security groups. The first difference is that NACLs are not directly tied to instances, but are tied with the subnet within your AWS virtual private cloud that contains the relevant instance. This means that the rules in a NACL apply to all of the instances within the subnet, in addition to all the rules from the security groups. So a specific instance inherits all the rules from the security groups associated with it, plus the rules associated with a NACL which is optionally associated with a subnet containing that instance. As a result NACLs have a broader reach, and affect more instances than a security group does. The second difference is that NACLs can be written to include an explicit action, so you can write ‘deny’ rules – for example to block traffic from a particular set of IP addresses which are known to be compromised. The ability to write ‘deny’ actions is a crucial part of NACL functionality. It’s all about the order As a consequence, when you have the ability to write both ‘allow’ rules and ‘deny’ rules, the order of the rules now becomes important. If you switch the order of the rules between a ‘deny’ and ‘allow’ rule, then you’re potentially changing your filtering policy quite dramatically. To manage this, AWS uses the concept of a ‘rule number’ within each NACL. By specifying the rule number, you can identify the correct order of the rules for your needs. You can choose which traffic you deny at the outset, and which you then actively allow. As such, with NACLs you can manage security tasks in a way that you cannot do with security groups alone. However, we did point out earlier that an instance inherits security rules from both the security groups, and from the NACLs – so how do these interact? The order by which rules are evaluated is this; For inbound traffic, AWS’s infrastructure first assesses the NACL rules. If traffic gets through the NACL, then all the security groups that are associated with that specific instance are evaluated, and the order in which this happens within and among the security groups is unimportant because they are all ‘allow’ rules. For outbound traffic, this order is reversed: the traffic is first evaluated against the security groups, and then finally against the NACL that is associated with the relevant subnet. You can see me explain this topic in person in my new whiteboard video: Schedule a demo Related Articles Speak to one of our experts Speak to one of our experts Work email* First name* Last name* Company* country* Select country... Short answer* By submitting this form, I accept AlgoSec's privacy policy Schedule a call

Master the full vulnerability management lifecycle by learning how to prioritize risks to harden your infrastructure against modern threats, and how to choose the ideal vulnerability management tool. Vulnerability management Select a size Which network Can AlgoSec be used for continuous compliance monitoring? Yes, AlgoSec supports continuous compliance monitoring. As organizations adapt their security policies to meet emerging threats and address new vulnerabilities, they must constantly verify these changes against the compliance frameworks they subscribe to. AlgoSec can generate risk assessment reports and conduct internal audits on-demand, allowing compliance officers to monitor compliance performance in real-time. Security professionals can also use AlgoSec to preview and simulate proposed changes to the organization’s security policies. This gives compliance officers a valuable degree of lead-time before planned changes impact regulatory guidelines and allows for continuous real-time monitoring. What is vulnerability management? Vulnerability management (VM) is the continuous, systematic process of identifying, evaluating, reporting, and remediating vulnerabilities existing in cyber assets, processes, endpoints, and systems. Adversaries are constantly scanning for exploitable gaps, making vulnerability management an ongoing discipline that helps organizations recognize and fix these gaps before adversaries find and weaponize them. The global average cost of a data breach stands at $4.44 million , per IBM’s 2025 report. This includes disruptions, loss of customer trust, and regulatory fines, making proper vulnerability management critical. Vulnerability management vs. patch management: Are they the same? No. Patch management involves the deployment of a solution, such as a software update, to fix a vulnerability. Vulnerability management , on the other hand, encompasses the broader process of identifying, assessing, and addressing all categories of vulnerabilities through diverse strategies. The strategic benefits of vulnerability management Effective vulnerability management brings numerous benefits: Improved asset visibility. Unified visibility across business applications and endpoints creates a baseline for capacity planning, license management, and technology refresh cycles. Fewer security risks. VM also directly reduces the probability of successful cyberattacks by systematically identifying and addressing exploitable weaknesses. Enhanced operational efficiency. Mature vulnerability management programs establish structured processes for security remediation, replacing ad hoc firefighting with systematic resolution workflows. Prevention of business disruption. The financial hit of a breach doesn’t stop at ransom payments. Operational disruption, reputational damage, customer attrition, and regulatory penalties often dwarf the costs of immediate incident response (IR). Support for compliance and audit requirements. From PCI-DSS to HIPAA, regulatory requirements mandate regular vulnerability assessments, including documented vulnerability management processes and evidence of continuous improvement. What are the types of managed vulnerabilities? Vulnerabilities manifest across diverse technical domains, with multiple types requiring specialized assessment approaches and remediation strategies: Software vulnerabilities : These bugs in application code, operating systems, firmware, or supporting libraries remain the most prevalent, particularly as complex application portfolios span legacy systems, commercial off-the-shelf products, and custom-developed code. Hardware vulnerabilities : These exist within the physical components and embedded firmware of computing devices and are especially relevant for on-premises infrastructure, which can be locally exploited. Network vulnerabilities: Arising from misconfigurations, design flaws, or network infrastructure and protocol weaknesses, network vulnerabilities often serve as force multipliers, allowing attackers who gain initial access to expand their presence across your entire environment. Process vulnerabilities : Weaknesses in operational procedures, change management practices, and organizational workflows are human and procedural gaps that can be as consequential as technical weaknesses. Control vulnerabilities: Encompassing weaknesses in security mechanisms themselves, i.e., the systems designed to prevent, detect, or respond to threats, this type of vulnerability includes: Inadequately tuned intrusion detection systems that generate false negatives Logging configurations that fail to capture security-relevant events Backup processes that cannot support timely recovery Incident response procedures that prove inadequate during actual crises Mixed vulnerabilities: These represent complex weaknesses that span multiple categories, requiring coordinated remediation across technical domains. How does vulnerability management work? An effective vulnerability management process has overlapping phases that feed insights from one stage into another. This cyclical approach helps ensure that the process matures over time by incorporating lessons learned from one stage into another. The five steps involved in the vulnerability management process are discovery, prioritization, resolution, verification, and reporting. Step 1: Discovery Discovery lays the foundation for effective vulnerability management. It encompasses the identification of vulnerable assets and data flows using scanners, agents, or pen tests: Vulnerability scanners: Scan infrastructure for vulnerabilities present in the CVE database; classified into what they scan and how they scan, i.e., network-based , host-based, or web-based Agent-based scans: Scan endpoints, servers, and workstations using lightweight software agents to identify vulnerabilities missed by external scanners, e.g., local privilege escalation, insecure configurations in applications that don't expose network services, and compliance violations in endpoint security controls Penetration tests: Employ white-hat hackers to identify vulnerabilities; more resource-intensive than agents but can uncover complex weaknesses scanners miss, plus validate the exploitability of found vulnerabilities The next phase involves making sure the right vulnerabilities receive attention first. Step 2: Prioritization A common vulnerability prioritization approach uses the Common Vulnerability Scoring System (CVSS). CVSS provides severity ratings based on technical characteristics, for example, potential impact, attack complexity, or privileges needed. A CVSS score of zero indicates the lowest possible severity, while 10 is the highest. However, CVSS scores don't account for asset criticality and threat context, making these scores alone insufficient for business risk prioritization. For this, the Exploit Prediction Scoring System (EPSS) helps by augmenting CVSS with an assessment of how likely a vulnerability will be exploited within the next 30 days. Still, effective vulnerability prioritization extends beyond scoring systems. The business context is also important. So, instead of solely prioritizing vulnerabilities based on their severity scores or the likelihood of exploitation, organizations must pause and ask: Is my business at risk? If yes, what applications are at risk, and how will their exploitation affect business operations? Of course, there is then the task of successfully resolving vulnerabilities found. Step 3: Resolution Vulnerability resolution can follow three possible paths: remediation, mitigation, or containment. And sometimes, a mix of all three. Remediation Remediation involves eliminating a vulnerability from the source via patch application, version upgrades, or configuration corrections. Although this is the ideal resolution approach, it isn't always immediately feasible. Why? An organization’s legacy systems may lack vendor support, while critical applications may also require extensive testing before patching. Mitigation Mitigation reduces risk exposure in the event of actual exploitation. Example techniques for this approach to vulnerability resolution include network segmentation, firewalls that filter exploit attempts, and enhanced monitoring to provide early warning of exploitation attempts. Containment Containment isolates vulnerable systems from healthy ones while remediation measures are developed and deployed. This approach proves particularly valuable when actively exploited vulnerabilities affect critical systems that cannot be patched immediately. Step 4: Verification Verification confirms that your previous resolution efforts successfully addressed the identified vulnerabilities without introducing operational problems . This ensures CISOs and the rest of the C-suite that holes believed to be plugged are not, in fact, still leaking. A common way to verify resolution is to conduct post-remediation scans or even pen testing for vulnerabilities involving multiple systems. Verification also includes operational validation to check that security fixes haven't degraded system functionality or user experience. If this step reveals incomplete fixes or any new issues caused during resolution, the next step is a root cause analysis to identify gaps in scanning, remediation procedures, testing protocols, or change management processes. Step 5: Reporting CISOs rely on two metrics to reveal gaps in vulnerability management workflows and provide objective measures of program maturity: Mean time to detect (MTTD): Measures the speed of identification of new vulnerabilities Mean time to remediate (MTTR): Quantifies the average duration between vulnerability detection and successful resolution With the right tools, companies can typically achieve MTTD in hours and MTTR in days for critical vulnerabilities, instead of weeks or months. This highlights that an organization’s choice of solution is a key part of the vulnerability management process. What to look for in vulnerability management tools When evaluating vulnerability management solutions, prioritize tools with the following capabilities. Comprehensive visibility across hybrid environments The ideal tool should discover and assess your assets regardless of where they’re hosted—on-prem, multiple cloud platforms, remote endpoints, or containerized workloads. To check the tool’s ability to comprehensively discover assets, ask the following questions: Does the solution natively integrate with CSPs’ APIs? Does it support diverse operating systems? Can it assess both traditional and modern infra? Risk contextualization through embedded threat intelligence For the sake of your business, tools that use generic severity scores are inadequate. Opt for a solution that: Layers your business context onto technical risk Considers asset criticality within the context of your industry Understands the data sensitivity requirements of your organization The result of opting for such a solution is vulnerability prioritization that reflects genuine business risk rather than theoretical severity. Streamlined workflow integration The ideal vulnerability tool should naturally integrate with your existing operational workflows instead of creating parallel shadow processes. The integration should be smooth and easy, as integration difficulties can significantly reduce your ROI from vulnerability management. Actionable reporting for diverse audiences It’s a best practice to choose a solution that provides relevant, easy-to-understand, and easy-to-apply security reports. This allows your security team to immediately understand what steps to take next. Automated change management with rapid response The best solutions incorporate automation to accelerate every phase of the vulnerability management lifecycle. This shortens MTTD and MTTR, and improves your overall security posture. Manage your vulnerabilities with Horizon AppViz AlgoSec Horizon AppViz delivers business-specific value by prioritizing a detected vulnerability risk not only by severity but also by business criticality. This helps you: Focus on the most important vulnerabilities first Contextualize your risk reduction efforts within a business application perspective Also, in your on-prem and cloud environment, Horizon AppViz incorporates data about your exposure level into risky firewall rules and into the what-if risk check analysis report you'll get periodically. Ready to prioritize vulnerabilities based on your business operations and automate the isolation of infected servers? Schedule a demo of AlgoSec to see how. 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14 Step Checklist for a Flawless Network Security Audit If security policies aren’t periodically updated to meet modern threat demands, organizations risk introducing vulnerabilities into their IT security posture. Comprehensive audit reports help security leaders gain in-depth visibility into their organization’s cybersecurity strategy and assess the resilience of its network infrastructure. Network Security Audit Checklist: What Does Your IT Security Audit Need to Cover? Cybersecurity... Cyber Attacks & Incident Response 14 Step Checklist for a Flawless Network Security Audit Tsippi Dach 2 min read Tsippi Dach Short bio about author here Lorem ipsum dolor sit amet consectetur. Vitae donec tincidunt elementum quam laoreet duis sit enim. Duis mattis velit sit leo diam. Tags Share this article 12/20/23 Published 14 Step Checklist for a Flawless Network Security Audit If security policies aren’t periodically updated to meet modern threat demands, organizations risk introducing vulnerabilities into their IT security posture. Comprehensive audit reports help security leaders gain in-depth visibility into their organization’s cybersecurity strategy and assess the resilience of its network infrastructure . Network Security Audit Checklist: What Does Your IT Security Audit Need to Cover? Cybersecurity audits demand an extensive overview of the organization’s security posture and risk profile. It requires gathering and analyzing network data to identify security vulnerabilities, monitor access controls, and assess potential threats. It also includes an overview of operational security practices, penetration testing results, and incident response playbooks . Ultimately, comprehensive risk assessment data should guide the organization towards improving its security measures and preventing hackers from breaching critical data and assets. A complete network security audit should include provide in-depth visibility into the following: Security controls and their implementation. The availability of network devices and access points. High-impact security risks and their potential consequences. The effectiveness of information security management processes. Performance data on security systems and network assets like firewalls. What Do Network Security Audits Help You Achieve? Conducting in-depth security audits helps security leaders identify data breach risks and develop plans for managing those risks. Audit results play an incredibly important role in preventative risk management and in the remediation of cyberattacks. Organizations that regularly conduct these kinds of assessments are better equipped to address the security weaknesses that might arise when onboarding new users, adding new endpoints to the network, or installing new apps. Network audits and security assessments can also help you achieve other important goals as well, such as: Identifying network performance issues and addressing them to improve overall performance. Unlocking opportunities to leverage network assets and mobile devices more efficiently. Demonstrating compliance with regulatory frameworks like the NIST Cybersecurity Framework 1.1 , ISO 27001 and 27002 , and SOC 2 Type 2 . Present security performance information to core stakeholders to demonstrate the value of security policies and controls. Update system security processes to address new vulnerabilities and potential threats. Recommended Read: 20 Best Network Security Solutions + FAQs How to Perform a Network Security Audit The network audit process involves collecting data, analyzing it to identify potential threats, and using it to compile a formal audit report. Depending on the size and complexity of the organization, this audit may be performed by an individual network analyst, a third-party IT security audit specialist, or an entire team of internal security professionals. These are the steps that make up a typical network audit: 1. Plan for the audit and inform everyone involved The audit process will involve many different types of technical tasks. The specific steps you take will change depending on the complexity of your network and the specialist talent required to assess data security in different IT contexts. You will need to verify authentication protocols, operating system security, password policies, and more. It’s rare for an individual security auditor to have all the technical skills necessary to do this on every app, device, and platform an organization uses. In most cases, you’ll need to work with other employees, third-party service providers, and other stakeholders to obtain the data you need. 2. Document all procedures and processes associated with the audit Recording every process that takes place during the audit is crucial. When preparing your final report, you may want to go back and verify some of the processes that took place to ensure the fidelity and accuracy of your data. If methodological errors creep into your data, they can skew your final report’s findings and end up damaging your ability to secure sensitive data correctly. Documentation is especially important in network security audits because you are looking for systematic flaws in the way user accounts, network assets, and security systems interact with one another. These flaws may not reveal themselves without clear documentation. 3. Review standard operating procedures and how they are managed Protecting sensitive information and critical network assets from security threats takes more than sophisticated technology. It also requires strict adherence to security policies and best practices from human users. Security audits should verify that employees and third-party providers are observing security policies in their operating procedures, and provide evidence attesting to that fact. Reviewing the organization’s procedure management system should provide key insight into whether users are following procedures or not. If they are not, there is a high risk of shadow IT processes leading to phishing attacks and security breaches. This should be reported so that the security team can find ways to remediate these threats. 4. Assess the training logs and operations Human error is behind eight out of ten cyberattacks . All customer-facing employees should be trained to detect phishing and social engineering attacks, and internal staff should know how to prevent malware from infecting the network. Every employee should understand how their role contributes to the security profile of the organization as a whole. Verifying authentication processes, permissions, and password policy is also part of employee training. Every user account should be protected by a consistent policy that follows the latest guidelines for beating brute force and dictionary-based credential attacks. Data encryption policies should keep sensitive login credentials secure even if hackers successfully compromise network assets. 5. Confirm the security patches for network software are up-to-date Start by creating a list of every software application used on the network. This can be a long, time-consuming manual process, but there are automated vulnerability scanning solutions that can help you automate this step. You will have to investigate each item on the list and determine whether new security patches are installed in a reasonably tight time frame. Keep in mind that cybercriminals often exploit security patch releases by scanning for organizations that delay installing new patches. Patch release changelogs essentially broadcast known vulnerabilities directly to hackers, so exploiting late patch installations is a trivial task. 6. Confirm the penetration testing policy and process is sufficient Penetration testing is one of the best ways to identify vulnerabilities on a network. If your organization has invested in pentesting initiatives, you will need to review and confirm its policies as part of the network security audit process. If you haven’t yet invested in pentesting, you may wish to outline a potential path for incorporating it into your security processes here. You may wish to verify the size and scope of your pentesting processes at this point. Assess some of the vulnerabilities you have uncovered and determine whether the organization is investing the appropriate resources into pentesting, or whether other security initiatives should take precedence. 7. Identify gaps and misconfigurations in your firewall policies Your organization’s firewalls play an important role managing traffic between network assets. Firewall rules should not be static. They must be continuously updated to meet the needs of the organization as it changes and grows. These devices can enforce bring your own device (BYOD) mobile policies, prevent distributed denial of service (DDoS) attacks, and contribute to proper network segmentation. Manually configuring firewall policies can be costly and time-consuming. Consider using an automated change management platform like AlgoSec Horizon Security Analyzer to rapidly identify potential vulnerabilities in your firewall rules. Document any changes you make and include those updates in your report. 8. Ensure all sensitive and confidential data is stored securely Every organization has to store some form of sensitive or confidential data. A major goal of network security audits is making sure this data is kept separate from non-sensitive data and protected by a higher standard of security. This data includes individuals’ names, addresses, phone numbers, financial information, and government ID data. Access to sensitive data should be only allowed when critical for business purposes, and every action involving sensitive data should generate comprehensive logs. The data itself should be encrypted so that even if attackers successfully breach the database, they won’t be able to use the data itself. It may also be worth considering an enterprise data backup solution to provide a failsafe in the event of a disaster. 9. Encrypt the hard disks on any company laptops Portable devices like laptops should not generally hold sensitive data. However, many employees can’t work without processing some amount of sensitive data and storing it on the local hard drive. This is usually less than critical data, but it can still contribute to a cyberattack if it falls into the wrong hands. Encrypting laptop hard disks can help prevent that from happening. If all the data on the device is encrypted, then the organization can avoid triggering a crisis-level security incident every time an employee misplaces or loses a company device. 10. Check the security of your wireless networks Wireless network security is vital for preventing hackers from conducting phishing attacks against employees and on-premises customers. If your organization’s Wi-Fi network is not secured, hackers can spoof the network and trick users into giving up vital information without their knowledge. All modern Wi-Fi equipment supports multiple security protocols. Avoid WEP and WPA – these are old protocols with well-known security vulnerabilities – and make sure your networks are using WPA2. If the organization has equipment that does not support WPA2, you must upgrade the equipment. 11. Scan for and identify any unauthorized access points Your network may have access points that were never set up or approved by the organization. Cybercriminals can use these unauthorized access points to steal data without triggering exfiltration alerts. Additional Wi-Fi frequencies are a common culprit here – your private Wi-Fi network may be configured to use the 2.4 GHz band even though you have equipment that supports 5 GHz frequencies. If someone sets up an access point on the 5 GHz frequency, you can easily overlook it. Data breaches can occur over a wide variety of similar media. USB and Bluetooth-enabled devices have introduced malware into corporate networks in the past. Your security audit should cover as many of these communication channels as possible. 12. Review the event log monitoring process The best way to verify security events is by analyzing the logs generated by network assets as they respond to user interactions. These logs can tell you who accessed sensitive data and report where and when that access took place. Security analysts can connect log data across applications to contextualize security incidents and understand how they took place. The problem is that even a small organization with a simple network can generate an enormous volume of log data every day. Your security audit should investigate the event log monitoring process and look for opportunities to streamline it. You may consider implementing a security information and event management (SIEM) platform or improving your existing one. 13. Compile a comprehensive report Once you’ve gathered all the relevant data and included your insight into the organization’s security posture, you are ready to create your audit report. This report should compile all of your findings into a single well-organized document, with evidence supporting the claims you make and clear recommendations for improving operational security moving forward. Consider creating customized data visualizations to showcase how key performance metrics change over time. The way you choose to communicate data can have a major impact on the way it is received, potentially convincing key stakeholders to implement the changes you suggest. 14. Send the final report to appropriate stakeholders and other key parties. Once you’ve finished your network security audit, you are ready to send it to your organization’s leaders and any other stakeholders who have an interest in your findings. Be prepared to explain your recommendations and justify the methods you used to collect and analyze the organization’s security data. The more confident you are in the accuracy of your findings, the better-equipped you’ll be to present them if called upon. Schedule a demo Related Articles Q1 at AlgoSec: What innovations and milestones defined our start to 2026? AlgoSec Reviews Mar 19, 2023 · 2 min read 2025 in review: What innovations and milestones defined AlgoSec’s transformative year in 2025? AlgoSec Reviews Mar 19, 2023 · 2 min read Navigating Compliance in the Cloud AlgoSec Cloud Mar 19, 2023 · 2 min read Speak to one of our experts Speak to one of our experts Work email* First name* Last name* Company* country* Select country... Short answer* By submitting this form, I accept AlgoSec's privacy policy Schedule a call

A ZeroTrust network architecture mitigates risk by only providing the minimally required access to your network resources But implementing it is easier said than done Webinars Micro-segmentation – from Strategy to Execution Organizations heavily invest in security solutions to keep their networks safe, but still struggle to close the security gaps. Micro-segmentation helps protect against the lateral movement of malware and minimizes the risk of insider threats. Micro-segmentation has received lots of attention as a possible solution, but many IT security professionals aren’t sure where to begin or what approach to take. In this practical webinar, Prof. Avishai Wool, AlgoSec’s CTO and co-founder will guide you through each stage of a micro-segmentation project – from developing the correct micro-segmentation strategy to effectively implementing it and continually maintaining your micro-segmented network. Register now for this live webinar and get a practical blueprint to creating your micro-segmentation policy: What is micro-segmentation. Common pitfalls in micro-segmentation projects and how to avoid them. The stages of a successful micro-segmentation project. The role of policy change management and automation in micro-segmentation. Don’t forget to also click on the links in the Attachments tab. July 7, 2020 Prof. Avishai Wool CTO & Co Founder AlgoSec Relevant resources Microsegmentation Defining Logical Segments Watch Video Micro-Segmentation based Network Security Strategies Keep Reading Choose a better way to manage your network Choose a better way to manage your network Work email* First name* Last name* Company* country* Select country... Short answer* By submitting this form, I accept AlgoSec's privacy policy Continue

Webinars Tightening security posture with micro-segmentation Micro-segmentation protects your network by limiting the lateral movement of ransomware and other threats in your network. Yet successfully implementing a defense-in-depth strategy using micro-segmentation may be complicated. In this second webinar in a series of two webinars about ransomware, Yitzy Tannenbaum, Product Marketing Manager from AlgoSec and Jan Heijdra, Cisco Security Specialist, will provide a blueprint to implementing micro-segmentation using Cisco Secure Workload (formerly Cisco Tetration) and AlgoSec Network Security Policy Management. Join our live webinar to learn: Why micro-segmentation is critical to fighting ransomware Understand your business applications to create your micro-segmentation policy Validate your micro-segmentation policy is accurate Enforce these granular policies on workloads and summarized policies across your infrastructure Use risk and vulnerability analysis to tighten your workload and network security Identify and manage security risk and compliance in your micro-segmented environment January 27, 2021 Jan Heijdra Cisco Security Specialist Yitzy Tannenbaum Product Marketing Manager Relevant resources Micro-segmentation – from strategy to execution Keep Reading Defining & Enforcing a Micro-segmentation Strategy Read Document Building a Blueprint for a Successful Micro-segmentation Implementation Keep Reading Choose a better way to manage your network Choose a better way to manage your network Work email* First name* Last name* Company* country* Select country... Short answer* By submitting this form, I accept AlgoSec's privacy policy Continue

Learn how automation can simplify the process of rule recertification and help determine which rules are still necessary Webinars Play by the rules: Automation for simplified rule recertification As time goes by, once effective firewall rules can become outdated. This results in bloated security policies which can slow down application delivery. Therefore, best practice and compliance requirements calls for rule recertification at least once per year. While rule recertification can be done manually by going through the comments fields of every rule, this is a tedious process which is also subject to the weaknesses of human error. Automation can simplify the process and help determine which rules are still necessary, if done right. Join security experts Asher Benbenisty and Tsippi Dach to learn about: Rule recertification as part of application delivery pipeline The importance of recertifying rules regularly Methods used for rule recertification The business application approach for rule recertification October 27, 2021 Tsippi Dach Director of marketing communications Asher Benbenisty Director of product marketing Relevant resources AlgoSec Horizon AppViz – Rule Recertification Watch Video Changing the rules without risk: mapping firewall rules to business applications Keep Reading Choose a better way to manage your network Choose a better way to manage your network Work email* First name* Last name* Company* country* Select country... Short answer* By submitting this form, I accept AlgoSec's privacy policy Continue

What is network change management? Network Change Management (NCM) is the process of planning, testing, and approving changes to a network infrastructure. The goal is to minimize network disruptions by following standardized procedures for controlled network changes. NCM, or network configuration and change management (NCCM), is all about staying connected and keeping things in check. When done the right way, it lets IT teams seamlessly roll out and track change requests, and boost the... Network Security Policy Management Network Change Management: Best Practices for 2024 Tsippi Dach 2 min read Tsippi Dach Short bio about author here Lorem ipsum dolor sit amet consectetur. Vitae donec tincidunt elementum quam laoreet duis sit enim. Duis mattis velit sit leo diam. Tags Share this article 2/8/24 Published What is network change management? Network Change Management (NCM) is the process of planning, testing, and approving changes to a network infrastructure. The goal is to minimize network disruptions by following standardized procedures for controlled network changes. NCM, or network configuration and change management (NCCM), is all about staying connected and keeping things in check. When done the right way, it lets IT teams seamlessly roll out and track change requests, and boost the network’s overall performance and safety. There are 2 main approaches to implementing NCM: manual and automated. Manual NCM is a popular choice that’s usually complex and time-consuming. A poor implementation may yield faulty or insecure configurations causing disruptions or potential noncompliance. These setbacks can cause application outages and ultimately need extra work to resolve. Fortunately, specialized solutions like the AlgoSec platform and its Horizon FireFlow solution exist to address these concerns. With inbuilt intelligent automation, these solutions make NCM easier as they cut out errors and rework usually tied to manual NCM. The network change management process The network change management process is a structured approach that organizations use to manage and implement changes to their network infrastructure. When networks are complex with many interdependent systems and components, change needs to be managed carefully to avoid unintended impacts. A systematic NCM process is essential to make the required changes promptly, minimize risks associated with network modifications, ensure compliance, and maintain network stability. The most effective NCM process leverages an automated NCM solution like the intelligent automation provided by the AlgoSec platform to streamline effort, reduce the risks of redundant changes, and curtail network outages and downtime. The key steps involved in the network change management process are: Step 1: Security policy development and documentation Creating a comprehensive set of security policies involves identifying the organization’s specific security requirements, relevant regulations, and industry best practices. These policies and procedures help establish baseline configurations for network devices. They govern how network changes should be performed – from authorization to execution and management. They also document who is responsible for what, how critical systems and information are protected, and how backups are planned. In this way, they address various aspects of network security and integrity, such as access control , encryption, incident response, and vulnerability management. Step 2: Change the request A formal change request process streamlines how network changes are requested and approved. Every proposed change is clearly documented, preventing the implementation of ad-hoc or unauthorized changes. Using an automated tool ensures that every change complies with the regulatory standards relevant to the organization, such as HIPAA, PCI-DSS, NIST FISMA, etc. This tool should be able to send automated notifications to relevant stakeholders, such as the Change Advisory Board (CAB), who are required to validate and approve normal and emergency changes (see below). Step 3: Change Implementation Standard changes – those implemented using a predetermined process, need no validation or testing as they’re already deemed low- or no-risk. Examples include installing a printer or replacing a user’s laptop. These changes can be easily managed, ensuring a smooth transition with minimal disruption to daily operations. On the other hand, normal and emergency changes require testing and validation, as they pose a more significant risk if not implemented correctly. Normal changes, such as adding a new server or migrating from on-premises to the cloud, entail careful planning and execution. Emergency changes address urgent issues that could introduce risks if not resolved promptly, like failing to install security patches or software upgrades, which may leave networks vulnerable to zero-day exploits and cyberattacks. Testing uncovers these potential risks, such as network downtime or new vulnerabilities that increase the likelihood of a malware attack. Automated network change management (NCM) solutions streamline simple changes, saving time and effort. For instance, AlgoSec’s firewall policy cleanup solution optimizes changes related to firewall policies, enhancing efficiency. Documenting all implemented changes is vital, as it maintains accountability and service level agreements (SLAs) while providing an audit trail for optimization purposes. The documentation should outline the implementation process, identified risks, and recommended mitigation steps. Network teams must establish monitoring systems to continuously review performance and flag potential issues during change implementation. They must also set up automated configuration backups for devices like routers and firewalls ensuring that organizations can recover from change errors and avoid expensive downtime. Step 4: Troubleshooting and rollbacks Rollback procedures are important because they provide a way to restore the network to its original state (or the last known “good” configuration) if the proposed change could introduce additional risk into the network or deteriorate network performance. Some automated tools include ready-to-use templates to simplify configuration changes and rollbacks. The best platforms use a tested change approval process that enables organizations to avoid bad, invalid, or risky configuration changes before they can be deployed. Troubleshooting is also part of the NCM process. Teams must be trained in identifying and resolving network issues as they emerge, and in managing any incidents that may result from an implemented change. They must also know how to roll back changes using both automated and manual methods. Step 5: Network automation and integration Automated network change management (NCM) solutions streamline and automate key aspects of the change process, such as risk analysis, implementation, validation, and auditing. These automated solutions prevent redundant or unauthorized changes, ensuring compliance with applicable regulations before deployment. Multi-vendor configuration management tools eliminate the guesswork in network configuration and change management. They empower IT or network change management teams to: Set real-time alerts to track and monitor every change Detect and prevent unauthorized, rogue, and potentially dangerous changes Document all changes, aiding in SLA tracking and maintaining accountability Provide a comprehensive audit trail for auditors Execute automatic backups after every configuration change Communicate changes to all relevant stakeholders in a common “language” Roll back undesirable changes as needed AlgoSec’s NCM platform can also be integrated with IT service management (ITSM) and ticketing systems to improve communication and collaboration between various teams such as IT operations and admins. Infrastructure as code (IaC) offers another way to automate network change management. IaC enables organizations to “codify” their configuration specifications in config files. These configuration templates make it easy to provision, distribute, and manage the network infrastructure while preventing ad-hoc, undocumented, or risky changes. Risks associated with network change management Network change management is a necessary aspect of network configuration management. However, it also introduces several risks that organizations should be aware of. Network downtime The primary goal of any change to the network should be to avoid unnecessary downtime. Whenever these network changes fail or throw errors, there’s a high chance of network downtime or general performance. Depending on how long the outage lasts, it usually results in users losing productive time and loss of significant revenue and reputation for the organization. IT service providers may also have to monitor and address potential issues, such as IP address conflicts, firmware upgrades, and device lifecycle management. Human errors Manual configuration changes introduce human errors that can result in improper or insecure device configurations. These errors are particularly prevalent in complex or large-scale changes and can increase the risk of unauthorized or rogue changes. Security issues Manual network change processes may lead to outdated policies and rulesets, heightening the likelihood of security concerns. These issues expose organizations to significant threats and can cause inconsistent network changes and integration problems that introduce additional security risks. A lack of systematic NCM processes can further increase the risk of security breaches due to weak change control and insufficient oversight of configuration files, potentially allowing rogue changes and exposing organizations to various cyberattacks. Compliance issues Poor NCM processes and controls increase the risk of non-compliance with regulatory requirements. This can potentially result in hefty financial penalties and legal liabilities that may affect the organization’s bottom line, reputation, and customer relationships. Rollback failures and backup issues Manual rollbacks can be time-consuming and cumbersome, preventing network teams from focusing on higher-value tasks. Additionally, a failure to execute rollbacks properly can lead to prolonged network downtime. It can also lead to unforeseen issues like security flaws and exploits. For network change management to be effective, it’s vital to set up automated backups of network configurations to prevent data loss, prolonged downtime, and slow recovery from outages. Troubleshooting issues Inconsistent or incorrect configuration baselines can complicate troubleshooting efforts. These wrong baselines increase the chances of human error, which leads to incorrect configurations and introduces security vulnerabilities into the network. Simplified network change management with AlgoSec AlgoSec’s configuration management solution automates and streamlines network management for organizations of all types. It provides visibility into the configuration of every network device and automates many aspects of the NCM process, including change requests, approval workflows, and configuration backups. This enables teams to safely and collaboratively manage changes and efficiently roll back whenever issues or outages arise. The AlgoSec platform monitors configuration changes in real-time. It also provides compliance assessments and reports for many security standards, thus helping organizations to strengthen and maintain their compliance posture. Additionally, its lifecycle management capabilities simplify the handling of network devices from deployment to retirement. Vulnerability detection and risk analysis features are also included in AlgoSec’s solution. The platform leverages these features to analyze the potential impact of network changes and highlight possible risks and vulnerabilities. This information enables network teams to control changes and ensure that there are no security gaps in the network. Click here to request a free demo of AlgoSec’s feature-rich platform and its configuration management tools. Schedule a demo Related Articles Q1 at AlgoSec: What innovations and milestones defined our start to 2026? AlgoSec Reviews Mar 19, 2023 · 2 min read 2025 in review: What innovations and milestones defined AlgoSec’s transformative year in 2025? AlgoSec Reviews Mar 19, 2023 · 2 min read Navigating Compliance in the Cloud AlgoSec Cloud Mar 19, 2023 · 2 min read Speak to one of our experts Speak to one of our experts Work email* First name* Last name* Company* country* Select country... Short answer* By submitting this form, I accept AlgoSec's privacy policy Schedule a call

Enterprise cybersecurity must constantly evolve to meet the threat posed by new malware variants and increasingly sophisticated hacker... Uncategorized Network Security vs. Application Security: The Complete Guide Tsippi Dach 2 min read Tsippi Dach Short bio about author here Lorem ipsum dolor sit amet consectetur. Vitae donec tincidunt elementum quam laoreet duis sit enim. Duis mattis velit sit leo diam. Tags Share this article 1/25/24 Published Enterprise cybersecurity must constantly evolve to meet the threat posed by new malware variants and increasingly sophisticated hacker tactics, techniques, and procedures. This need drives the way security professionals categorize different technologies and approaches. The difference between network security and application security is an excellent example. These two components of the enterprise IT environment must be treated separately in any modern cybersecurity framework. This is because they operate on different levels of the network and they are exposed to different types of threats and security issues. To understand why, we need to cover what each category includes and how they contribute to an organization’s overall information security posture. IT leaders and professionals can use this information to their organization’s security posture, boost performance, and improve event outcomes. What is Network Security? Network security focuses on protecting assets located within the network perimeter. These assets include data, devices, systems, and other facilities that enable the organization to pursue its interests — just about anything that has value to the organization can be an asset. This security model worked well in the past, when organizations had a clearly defined network perimeter. Since the attack surface was well understood, security professionals could deploy firewalls, intrusion prevention systems, and secure web gateways directly at the point of connection between the internal network and the public internet. Since most users, devices and applications were located on-site, security leaders had visibility and control over the entire network. This started to change when organizations shifted to cloud computing and remote work, supported by increasingly powerful mobile devices. Now most organizations do not have a clear network perimeter, so the castle-and-moat approach to network security is no longer effective. However, the network security approach isn’t obsolete. It is simply undergoing a process of change, adjusting to smaller, more segmented networks governed by Zero Trust principles and influenced by developments in application security. Key Concepts of Network Security Network security traditionally adopts a castle-and-moat approach, where all security controls exist at the network perimeter. Users who attempt to access the network must authenticate and verify themselves before being allowed to enter. Once they enter, they can freely move between assets, applications, and systems without the need to re-authenticate themselves. In modern, cloud-enabled networks, the approach is less like a castle and more like a university campus. There may be multiple different subnetworks working together, with different security controls based on the value of the assets under protection. In these environments, network security is just one part of a larger, multi-layered security deployment. This approach focuses on protecting IT infrastructure, like routers, firewalls, and network traffic. Each of these components has a unique role to play securing assets inside the network: Firewalls act as filters for network traffic , deciding what traffic is allowed to pass through and denying the rest. Well-configured firewall deployments don’t just protect internal assets from incoming traffic, they also protect against data from leaking outside the network as well. Intrusion Prevention Systems (IPS) are security tools that continuously monitor the network for malicious activity and take action to block unauthorized processes. They may search for known threat signatures, monitor for abnormal network activity, or enforce custom security policies. Virtual Private Networks (VPNs) encrypt traffic between networks and hide users’ IP addresses from the public internet. This is useful for maintaining operational security in a complex network environment because it prevents threat actors from intercepting data in transit. Access control tools allow security leaders to manage who is authorized to access data and resources on the network. Secure access control policies determine which users have permission to access sensitive assets, and the conditions under which that access might be revoked. Why is Network Security Important? Network security tools protect organizations against cyberattacks that target their network infrastructure, and prevent hackers from conducting lateral movement. Many modern network security solutions focus on providing deep visibility into network traffic, so that security teams can identify threat actors who have successfully breached the network perimeter and gained unauthorized access. Network Security Technologies and Strategies Firewalls : These tools guard the perimeters of network infrastructure. Firewalls filter incoming and outgoing traffic to prevent malicious activity. They also play an important role in establishing boundaries between network zones, allowing security teams to carefully monitor users who move between different parts of the network. These devices must be continuously monitored and periodically reconfigured to meet the organization’s changing security needs. VPNs : Secure remote access and IP address confidentiality is an important part of network security. VPNs ensure users do not leak IP data outside the network when connecting to external sources. They also allow remote users to access sensitive assets inside the network even when using unsecured connections, like public Wi-Fi. Zero Trust Models : Access control and network security tools provide validation for network endpoints, including IoT and mobile devices. This allows security teams to re-authenticate network users even when they have already verified their identities and quickly disconnect users who fail these authentication checks. What is Application Security? Application security addresses security threats to public-facing applications, including APIs. These threats may include security misconfigurations, known vulnerabilities, and threat actor exploits. Since these network assets have public-facing connections, they are technically part of the network perimeter — but they do not typically share the same characteristics as traditional network perimeter assets. Unlike network security, application security extends to the development and engineering process that produces individual apps. It governs many of the workflows that developers use when writing code for business contexts. One of the challenges to web application security is the fact that there is no clear and universal definition for what counts as an application. Most user-interactive tools and systems count, especially ones that can process data automatically through API access. However, the broad range of possibilities leads to an enormous number of potential security vulnerabilities and exposures, all of which must be accounted for. Several frameworks and methods exist for achieving this: The OWASP Top Ten is a cybersecurity awareness document that gives developers a broad overview of the most common application vulnerabilities . Organizations that adopt the document give software engineers clear guidance on the kinds of security controls they need to build into the development lifecycle. The Common Weakness Enumeration (CWE) is a long list of software weaknesses known to lead to security issues. The CWE list is prioritized by severity, giving organizations a good starting point for improving application security. Common Vulnerabilities and Exposures (CVE) codes contain extensive information on publicly disclosed security vulnerabilities, including application vulnerabilities. Every vulnerability has its own unique CVE code, which gives developers and security professionals the ability to clearly distinguish them from one another. Key Concepts of Application Security The main focus of application security is maintaining secure environments inside applications and their use cases. It is especially concerned with the security vulnerabilities that arise when web applications are made available for public use. When public internet users can interact with a web application directly, the security risks associated with that application rise significantly. As a result, developers must adopt security best practices into their workflows early in the development process. The core elements of application security include: Source code security, which describes a framework for ensuring the security of the source code that powers web-connected applications. Code reviews and security approvals are a vital part of this process, ensuring that vulnerable code does not get released to the public. Securing the application development lifecycle by creating secure coding guidelines, providing developers with the appropriate resources and training, and creating remediation service-level agreements (SLAs) for application security violations. Web application firewalls, which operate separately from traditional firewalls and exclusively protect public-facing web applications and APIs. Web application firewalls monitor and filter traffic to and from a web source, protecting web applications from security threats wherever they happen to be located. Why is Application Security Important? Application security plays a major role ensuring the confidentiality, integrity, and availability of sensitive data processed by applications. Since public-facing applications often collect and process end-user data, they make easy targets for opportunistic hackers. At the same time, robust application security controls must exist within applications to address security vulnerabilities when they emerge and prevent data breaches. Application Security Technologies Web Application Firewalls. These firewalls provide protection specific to web applications, preventing attackers from conducting SQL injection, cross-site scripting, and denial-of-service attacks, among others. These technical attacks can lead to application instability and leak sensitive information to attackers. Application Security Testing. This important step includes penetration testing, vulnerability scanning, and the use of CWE frameworks. Pentesters and application security teams work together to ensure public-facing web applications and APIs hold up against emerging threats and increasingly sophisticated attacks. App Development Security. Organizations need to incorporate security measures into their application development processes. DevOps security best practices include creating modular, containerized applications uniquely secured against threats regardless of future changes to the IT environment or device operating systems. Integrating Network and Application Security Network and application security are not mutually exclusive areas of expertise. They are two distinct parts of your organization’s overall security posture. Identifying areas where they overlap and finding solutions to common problems will help you optimize your organization’s security capabilities through a unified security approach. Overlapping Areas Network and application security solutions protect distinct areas of the enterprise IT environment, but they do overlap in certain areas. Security leaders should be aware of the risk of over-implementation, or deploying redundant security solutions that do not efficiently improve security outcomes. Security Solutions : Both areas use security tools like intrusion prevention systems, authentication, and encryption. Network security solutions may treat web applications as network entry points, but many hosted web applications are located outside the network perimeter. This makes it difficult to integrate the same tools, policies, and controls uniformly across web application toolsets. Cybersecurity Strategy : Your strategy is an integral part of your organization’s security program, guiding your response to different security threats. Security architects must configure network and application security solutions to work together in use case scenarios where one can meaningfully contribute to the other’s operations. Unique Challenges Successful technology implementations of any kind come with challenges, and security implementations are no different. Both application and network security deployments will present issues that security leaders must be prepared to address. Application security challenges include: Maintaining usability. End users will not appreciate security implementations that make apps harder to use. Security teams need to pay close attention to how new features impact user interfaces and workflows. Detecting vulnerabilities in code. Ensuring all code is 100% free of vulnerabilities is rarely feasible. Instead, organizations need to adopt a proactive approach to detecting vulnerabilities in code and maintaining source code security. Managing source code versioning. Implementing DevSecOps processes can make it hard for organizations to keep track of continuously deployed security updates and integrations. This may require investing in additional toolsets and versioning capabilities. Network security challenges include: Addressing network infrastructure misconfigurations. Many network risks stem from misconfigured firewalls and other security tools. One of the main challenges in network security is proactively identifying these misconfigurations and resolving them before they lead to security incidents. Monitoring network traffic efficiently. Monitoring network traffic can make extensive use of limited resources, leading to performance issues or driving up network-related costs. Security leaders must find ways to gain insight into security issues without raising costs beyond what the organization can afford. Managing network-based security risks effectively. Translating network activity insights into incident response playbooks is not always easy. Simply knowing that unauthorized activity might be happening is not enough. Security teams must also be equipped to address those risks and mitigate potential damage. Integrating Network and Application Security for Unified Protection A robust security posture must contain elements of both network and application security. Public-facing applications must be able to filter out malicious traffic and resist technical attacks, and security teams need comprehensive visibility into network activity and detecting insider threats . This is especially important in cloud-enabled hybrid environments. If your organization uses cloud computing through a variety of public and private cloud vendors, you will need to extend network visibility throughout the hybrid network. Maintaining cloud security requires a combination of network and web application security capable of producing results in a cost-effective way. Highly automated security platforms can help organizations implement proactive security measures that reduce the need to hire specialist internal talent for every configuration and policy change. Enterprise-ready cloud security solutions leverage automation and machine learning to reduce operating costs and improve security performance across the board. Unify Network and Application Security with AlgoSec No organization can adequately protect itself from a wide range of cyber threats without investing in both network and application security. Technology continues to evolve and threat actors will adapt their tactics to exploit new vulnerabilities as they are discovered. Integrating network and application security into a single, unified approach gives security teams the ability to create security policies and incident response plans that address real-world threats more effectively. Network visibility and streamlined change management are vital to achieving this goal. AlgoSec is a security policy management and application connectivity platform that provides in-depth information on both aspects of your security posture. Find out how AlgoSec can help you centralize policy and change management in your network. Schedule a demo Related Articles Q1 at AlgoSec: What innovations and milestones defined our start to 2026? AlgoSec Reviews Mar 19, 2023 · 2 min read 2025 in review: What innovations and milestones defined AlgoSec’s transformative year in 2025? AlgoSec Reviews Mar 19, 2023 · 2 min read Navigating Compliance in the Cloud AlgoSec Cloud Mar 19, 2023 · 2 min read Speak to one of our experts Speak to one of our experts Work email* First name* Last name* Company* country* Select country... Short answer* By submitting this form, I accept AlgoSec's privacy policy Schedule a call

Webinars Radically reduce firewall rules with application-driven rule recertification Does your network still have obsolete firewall rules? Do you often feel overwhelmed with the number of firewall rules in your network? To make sure your network is secure and compliant, you need to regularly review and recertify firewall rules. However, manual firewall rule recertification is complex, time-consuming and error-prone, and mistakes may cause application outages. Discover a better way to recertify your firewall rules with Asher Benbenisty, AlgoSec’s Director of Product Marketing, as he discusses how associating application connectivity with your firewall rules can radically reduce the number of firewall rules on your network as well as the efforts involved in rule recertification. In this webinar, we will discuss: The importance of regularly reviewing and recertifying your firewall rules Integrating application connectivity into your firewall rule recertification process Automatically managing the rule-recertification process using an application-centric approach October 14, 2020 Asher Benbenisty Director of product marketing Relevant resources Changing the rules without risk: mapping firewall rules to business applications Keep Reading AlgoSec Horizon AppViz – Rule Recertification Watch Video Choose a better way to manage your network Choose a better way to manage your network Work email* First name* Last name* Company* country* Select country... Short answer* By submitting this form, I accept AlgoSec's privacy policy Continue

AlgoBot is an intelligent chatbot that answers your questions, in English Use this personal assistant for security policy change management processes Algo Now AI-powered security assistant for network security policy
management tasks Your AI security policy management assistant. Algo is an AI-powered assistant that connects to the AlgoSec platform to deliver fast, natural-language access to core security policy workflows - so teams can get answers, run analysis, and drive change requests without switching tools. With Algo you can: Accelerate security policy decisions with AI-powered, natural-language guidance Reduce ticket resolution time by giving support teams instant, contextual answers Enable application owners to self-serve connectivity questions with guardrails Streamline change management by creating and tracking requests directly from chat Talk to Algo in natural language from Microsoft Teams (desktop, web, or mobile) so you can stay in your workflow while accessing AlgoSec capabilities Self-service security policy management Algo offloads day-to-day tasks from firewall and network administrators, by automatically answering typical security policy management questions and handling maintenance tasks. Ideal for a wide range of stakeholders including security teams and cyber analysts, application owners and developers, help desk, support, network, server and IT teams, Algo can, for example: Check if traffic is currently allowed between IP addresses, servers and applications Open change requests to allow network connectivity Check on the status of a change request Easy and convenient access to the AlgoSec security management solution Algo gives firewall and network administrators an easy and convenient way to access the AlgoSec Security Management Solution, to quickly take care of security policy management maintenance tasks. Using Algo, firewall and network administrators can, for example: Troubleshoot network connectivity issues and security incidents Check the status of change requests and approve changes Schedule time with one of our experts Work email* First name* Last name* Company* country* Select country... Short answer* By submitting this form, I accept AlgoSec's privacy policy Continue