Modern organizations face a wide and constantly changing range of network security threats, and security leaders must constantly update... Network Security Network Security Threats & Solutions for Cybersecurity Leaders 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 2/11/24 Published Modern organizations face a wide and constantly changing range of network security threats, and security leaders must constantly update their security posture against them. As threat actors change their tactics, techniques, and procedures, exploit new vulnerabilities , and deploy new technologies to support their activities — it’s up to security teams to respond by equipping themselves with solutions that address the latest threats. The arms race between cybersecurity professionals and cybercriminals is ongoing. During the COVID-19 pandemic, high-profile ransomware attacks took the industry by storm. When enterprise security teams responded by implementing secure backup functionality and endpoint detection and response, cybercriminals shifted towards double extortion attacks. The cybercrime industry constantly invests in new capabilities to help hackers breach computer networks and gain access to sensitive data. Security professionals must familiarize themselves with the latest network security threats and deploy modern solutions that address them. What are the Biggest Network Security Threats? 1. Malware-based Cyberattacks Malware deserves a category of its own because so many high-profile attacks rely on malicious software to work. These include everything from the Colonial Pipeline Ransomware attack to historical events like Stuxnet . Broadly speaking, cyberattacks that rely on launching malicious software on computer systems are part of this category. There are many different types of malware-based cyberattacks, and they vary widely in scope and capability. Some examples include: Viruses. Malware that replicates itself by inserting its own code into other applications are called viruses. They can spread across devices and networks very quickly. Ransomware. This type of malware focuses on finding and encrypting critical data on the victim’s network and then demanding payment for the decryption key. Cybercriminals typically demand payment in the form of cryptocurrency, and have developed a sophisticated industrial ecosystem for conducting ransomware attacks. Spyware. This category includes malware variants designed to gather information on victims and send it to a third party without your consent. Sometimes cybercriminals do this as part of a more elaborate cyberattack. Other times it’s part of a corporate espionage plan. Some spyware variants collect sensitive information that cybercriminals value highly. Trojans. These are malicious applications disguised as legitimate applications. Hackers may hide malicious code inside legitimate software in order to trick users into becoming victims of the attack. Trojans are commonly hidden as an email attachment or free-to-download file that launches its malicious payload after being opened in the victim’s environment. Fileless Malware. This type of malware leverages legitimate tools native to the IT environment to launch an attack. This technique is also called “living off the land” because hackers can exploit applications and operating systems from inside, without having to download additional payloads and get them past firewalls. 2. Network-Based Attacks These are attacks that try to impact network assets or functionality, often through technical exploitations. Network-based attacks typically start at the edge of the network, where it sends and receives traffic to the public internet. Distributed Denial-of-Service (DDoS) Attacks. These attacks overwhelm network resources, leading to downtime and service unavailability, and in some cases, data loss . To launch DDoS attacks, cybercriminals must gain control over a large number of compromised devices and turn them into bots. Once thousands (or millions) of bots using unique IP addresses request server resources, the server breaks down and stops functioning. Man-in-the-Middle (MitM) Attacks: These attacks let cybercriminals eavesdrop on communications between two parties. In some cases, they can also alter the communications between both parties, allowing them to plan and execute more complex attacks. Many different types of man-in-the-middle attacks exist, including IP spoofing, DNS spoofing, SSL stripping, and others. 3. Social Engineering and Phishing These attacks are not necessarily technical exploits. They focus more on abusing the trust that human beings have in one another. Usually, they involve the attacker impersonating someone in order to convince the victim to give up sensitive data or grant access to a secure asset. Phishing Attacks. This is when hackers create fake messages telling victims to take some kind of action beneficial to the attacker. These deceptive messages can result in the theft of login credentials, credit card information, or more. Most major institutions are regularly impersonated by hackers running phishing scams, like the IRS . Social Engineering Attacks. These attacks use psychological manipulation to trick victims into divulging confidential information. A common example might be a hacker contacting a company posing as a third-party technology vendor, asking for access to a secure system, or impersonating the company CEO and demanding an employee pay a fictitious invoice. 4. Insider Threats and Unauthorized Access These network security threats are particularly dangerous because they are very difficult to catch. Most traditional security tools are not configured to detect malicious insiders, who generally have permission to access sensitive data and assets. Insider Threats. Employees, associates, and partners with access to sensitive data may represent severe security risks. If an authorized user decides to steal data and sell it to a hacker or competitor, you may not be able to detect their attack using traditional security tools. That’s what makes insider threats so dangerous, because they are often undetectable. Unauthorized Access. This includes a broad range of methods used to gain illegal access to networks or systems. The goal is usually to steal data or alter it in some way. Attackers may use credential-stuffing attacks to access sensitive networks, or they can try brute force methods that involve automatically testing millions of username and password combinations until they get the right one. This often works because people reuse passwords that are easy to remember. Solutions to Network Security Threats Each of the security threats listed above comes with a unique set of risks, and impacts organizations in a unique way. There is no one-size-fits-all solution to navigating these risks. Every organization has to develop a cybersecurity policy that meets its specific needs. However, the most secure organizations usually share the following characteristics. Fundamental Security Measures Well-configured Firewalls. Firewalls control incoming and outgoing network traffic based on security rules. These rules can deny unauthorized traffic attempting to connect with sensitive network assets and block sensitive information from traveling outside the network. In each case, robust configuration is key to making the most of your firewall deployment . Choosing a firewall security solution like AlgoSec can dramatically improve your defenses against complex network threats. Anti-malware and Antivirus Software. These solutions detect and remove malicious software throughout the network. They run continuously, adapting their automated scans to include the latest threat detection signatures so they can block malicious activity before it leads to business disruption. Since these tools typically rely on threat signatures, they cannot catch zero-day attacks that leverage unknown vulnerabilities. Advanced Protection Tools Intrusion Prevention Systems. These security tools monitor network traffic for behavior that suggests unauthorized activity. When they find evidence of cyberattacks and security breaches, they launch automated responses that block malicious activity and remove unauthorized users from the network. Network Segmentation. This is the process of dividing networks into smaller segments to control access and reduce the attack surface. Highly segmented networks are harder to compromise because hackers have to repeatedly pass authentication checks to move from one network zone to another. This increases the chance that they fail, or generate activity unusual enough to trigger an alert. Security and Information Event Management (SIEM) platforms. These solutions give security analysts complete visibility into network and application activity across the IT environment. They capture and analyze log data from firewalls, endpoint devices, and other assets and correlate them together so that security teams can quickly detect and respond to unauthorized activity, especially insider threats. Endpoint Detection and Response (EDR). These solutions provide real-time visibility into the activities of endpoint devices like laptops, desktops, and mobile phones. They monitor these devices for threat indicators and automatically respond to identified threats before they can reach the rest of the network. More advanced Extended Detection and Response (XDR) solutions draw additional context and data from third party security tools and provide in-depth automation . Authentication and Access Control Multi-Factor Authentication (MFA). This technology enhances security by requiring users to submit multiple forms of verification before accessing sensitive data. This makes it useful against phishing attacks, social engineering, and insider threats, because hackers need more than just a password to gain entry to secure networks. MFA also plays an important role in Zero Trust architecture. Strong Passwords and Access Policies. There is no replacement for strong password policies and securely controlling user access to sensitive data. Security teams should pay close attention to password policy compliance, making sure employees do not reuse passwords across accounts and avoid simple memory hacks like adding sequential numbers to existing passwords. Preventing Social Engineering and Phishing While SIEM platforms, MFA policies and strong passwords go a long way towards preventing social engineering and phishing attacks, there are a few additional security measures worth taking to reduce these risks: Security Awareness Training. Leverage a corporate training LMS to educate employees about phishing and social engineering tactics. Phishing simulation exercises can help teach employees how to distinguish phishing messages from legitimate ones, and pinpoint the users at highest risk of falling for a phishing scam. Email Filtering and Verification: Email security tools can identify and block phishing emails before they arrive in the inbox. They often rely on scanning the reputation of servers that send incoming emails, and can detect discrepancies in email metadata that suggest malicious intent. Even if these solutions generally can’t keep 100% of malicious emails out of the inbox, they significantly reduce email-related threat risks. Dealing with DDoS and MitM Attacks These technical exploits can lead to significant business disruption, especially when undertaken by large-scale threat actors with access to significant resources. Your firewall configuration and VPN policies will make the biggest difference here: DDoS Prevention Systems. Protect against distributed denial of service attacks by implementing third-party DDoS prevention solutions, deploying advanced firewall configurations, and using load balancers. Some next generation firewalls (NGFWs) can increase protection against DDoS attacks by acting as a handshake proxy and dropping connection requests that do not complete the TCP handshake process. VPNs and Encryption: VPNs provide secure communication channels that prevent MitM attacks and data eavesdropping. Encrypted traffic can only be intercepted by attackers who go through the extra step of obtaining the appropriate decryption key. This makes it much less likely they focus on your organization instead of less secure ones that are easier to target. Addressing Insider Threats Insider threats are a complex security issue that require deep, multi-layered solutions to address. This is especially true when malicious insiders are actually employees with legitimate user credentials and privileges. Behavioral Auditing and Monitoring: Regular assessments and monitoring of user activities and network traffic are vital for detecting insider threats . Security teams need to look beyond traditional security deployments and gain insight into user behaviors in order to catch authorized users doing suspicious things like escalating their privileges or accessing sensitive data they do not normally access. Zero Trust Security Model. Assume no user or device is trustworthy until verified. Multiple layers of verification between highly segmented networks — with multi-factor authentication steps at each layer — can make it much harder for insider threats to steal data and conduct cyberattacks. Implementing a Robust Security Strategy Directly addressing known threats should be just one part of your cybersecurity strategy. To fully protect your network and assets from unknown risks, you must also implement a strong security posture that can address risks associated with new and emerging cyber threats. Continual Assessment and Improvement The security threat landscape is constantly changing, and your security posture must adapt and change in response. It’s not always easy to determine exactly how your security posture should change, which is why forward-thinking security leaders periodically invest in vulnerability assessments designed to identify security vulnerabilities that may have been overlooked. Once you have a list of security weaknesses you need to address, you can begin the process of proactively addressing them by configuring your security tech stack and developing new incident response playbooks. These playbooks will help you establish a coordinated, standardized response to security incidents and data breaches before they occur. Integration of Security Tools Coordinating incident response plans isn’t easy when every tool in your tech stack has its own user interface and access control permissions. You may need to integrate your security tools into a single platform that allows security teams to address issues across your entire network from a single point of reference. This will help you isolate and address security issues on IoT devices and mobile devices without having to dedicate a particular team member exclusively to that responsibility. If a cyberattack that targets mobile apps occurs, your incident response plan won’t be limited by the bottleneck of having a single person with sufficient access to address it. Similarly, highly integrated security tools that leverage machine learning and automation can enhance the scalability of incident response and speed up incident response processes significantly. Certain incident response playbooks can be automated entirely, providing near-real-time protection against sophisticated threats and freeing your team to focus on higher-impact strategic initiatives. Developing and Enforcing Security Policies Developing and enforcing security policies is one of the high-impact strategic tasks your security team should dedicate a great deal of time and effort towards. Since the cybersecurity threat landscape is constantly changing, you must commit to adapting your policies in response to new and emerging threats quickly. That means developing a security policy framework that covers all aspects of network and data security. Similarly, you can pursue compliance with regulatory standards that ensure predictable outcomes from security incidents. Achieving compliance with standards like NIST, CMMC, PCI-DSS, and HIPPA can help you earn customers’ trust and open up new business opportunities. AlgoSec: Your Partner in Network Security Protecting against network threats requires continuous vigilance and the ability to adapt to fast-moving changes in the security landscape. Every level of your organization must be engaged in security awareness and empowered to report potential security incidents. Policy management and visibility platforms like AlgoSec can help you gain control over your security tool configurations. This enhances the value of continuous vigilance and improvement, and boosts the speed and accuracy of policy updates using automation. Consider making AlgoSec your preferred security policy automation and visibility platform. 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

Containers aren’t VMs. They’re a great lightweight deployment solution, but they’re only as secure as you make them. You need to keep... Cloud Security Best Practices for Docker Containers’ Security Rony Moshkovich 2 min read Rony Moshkovich 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 7/27/20 Published Containers aren’t VMs. They’re a great lightweight deployment solution, but they’re only as secure as you make them. You need to keep them in processes with limited capabilities, granting them only what they need. A process that has unlimited power, or one that can escalate its way there, can do unlimited damage if it’s compromised. Sound security practices will reduce the consequences of security incidents. Don’t grant absolute power It may seem too obvious to say, but never run a container as root. If your application must have quasi-root privileges, you can place the account within a user namespace , making it the root for the container but not the host machine. Also, don’t use the –privileged flag unless there’s a compelling reason. It’s one thing if the container does direct I/O on an embedded system, but normal application software should never need it. Containers should run under an owner that has access to its own resources but not to other accounts. If a third-party image requires the –privileged flag without an obvious reason, there’s a good chance it’s badly designed if not malicious. Avoid running a Docker socket in a container. It gives the process access to the Docker daemon, which is a useful but dangerous power. It includes the ability to control other containers, images, and volumes. If this kind of capability is necessary, it’s better to go through a proper API. Grant privileges as needed Applying the principle of least privilege minimizes container risks. A good approach is to drop all capabilities using –cap-drop=all and then enabling the ones that are needed with –cap-add . Each capability expands the attack surface between the container and its environment. Many workloads don’t need any added capabilities at all. The no-new-privileges flag under security-opt is another way to protect against privilege escalation. Dropping all capabilities does the same thing, so you don’t need both. Limiting the system resources which a container guards not only against runaway processes but against container-based DoS attacks. Beware of dubious images When possible, use official Docker images. They’re well documented and tested for security issues, and images are available for many common situations. Be wary of backdoored images . Someone put 17 malicious container images on Docker Hub, and they were downloaded over 5 million times before being removed. Some of them engaged in cryptomining on their hosts, wasting many processor cycles while generating $90,000 in Monero for the images’ creator. Other images may leak confidential data to an outside server. Many containerized environments are undoubtedly still running them. You should treat Docker images with the same caution you’d treat code libraries, CMS plugins, and other supporting software, Use only code that comes from a trustworthy source and is delivered through a reputable channel. Other considerations It should go without saying, but you need to rebuild your images regularly. The libraries and dependencies that they use get security patches from time to time, and you need to make sure your containers have them applied. On Linux, you can gain additional protection from security profiles such as secomp and AppArmor . These modules, used with the security-opt settings, let you set policies that will be automatically enforced. Container security presents its distinctive challenges. Experience with traditional application security helps in many ways, but Docker requires an additional set of practices. Still, the basics apply as much as ever. Start with trusted code. Don’t give it the power to do more than it needs to do. Use the available OS and Docker features for enhancing security. Monitor your systems for anomalous behavior. If you take all these steps, you’ll ward off the large majority of threats to your Docker environment. 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

NAT Network Security I came across some discussions regarding Network Address Translation (NAT) and its impact on security and the... Firewall Change Management To NAT or not to NAT – It’s not really a question 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 11/26/13 Published NAT Network Security I came across some discussions regarding Network Address Translation (NAT) and its impact on security and the network. Specifically the premise that “ NAT does not add any real security to a network while it breaks almost any good concepts of a structured network design ” is what I’d like to address. When it comes to security, yes, NAT is a very poor protection mechanism and can be circumvented in many ways. It causes headaches to network administrators. So now that we’ve quickly summarized all that’s bad about NAT, let’s address the realization that most organizations use NAT because they HAVE to, not because it’s so wonderful. The alternative to using NAT has a prohibitive cost and is possibly impossible. To dig into what I mean, let’s walk through the following scenario… Imagine you have N devices in your network that need an IP address (every computer, printer, tablet, smartphone, IP phone, etc. that belongs to your organization and its guests). Without NAT you would have to purchase N routable IP addresses from your ISP. The costs would skyrocket! At AlgoSec we run a 120+ employee company in numerous countries around the globe. We probably use 1000 IP addresses. We pay for maybe 3 routable IP addresses and NAT away the rest. Without NAT the operational cost of our IP infrastructure would go up by a factor of x300. NAT Security With regards to NAT’s impact on security, just because NAT is no replacement for a proper firewall doesn’t mean it’s useless. Locking your front door also provides very low-grade security – people still do it, since it’s a lot better than not locking your front door. 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 gross dollar retention rate of over 90% and 36% year-over-year new business growth highlight adoption across industries AlgoSec’s Horizon Platform Fuels Company Growth and Global Application-Centric Security A gross dollar retention rate of over 90% and 36% year-over-year new business growth highlight adoption across industries September 9, 2025 Speak to one of our experts RIDGEFIELD PARK, NJ, September 9, 2025 – AlgoSec , a global cybersecurity leader, today announced a gross dollar retention rate of over 90% in the first half of 2025, following the launch of its AlgoSec Horizon platform. Since its release, the Horizon platform has gained adoption across industries, underscoring the market need for convergence of cloud and on-premises networks. This widespread adoption has driven a 36% increase in new annual recurring revenue (ARR) in the first half of 2025 compared to 2024. The Horizon platform utilizes advanced AI capabilities to automatically discover and identify an organization’s business applications across complex hybrid networks, and remediate risks more effectively. Its Intelligent automation minimizes misconfigurations and enhances operational resilience to accelerate application delivery from weeks to hours. In one such example, one of the largest financial institutions in the U.S. uncovered 1,800 applications and their connectivity requirements within the first two weeks of using Horizon. Throughout September and October, AlgoSec is running the Horizon Tour, a series of sessions showcasing the platform’s capabilities and expert insights for enterprise security teams across EMEA and the U.S. “Security teams today are being asked to protect applications in a hybrid world, from multi-clouds to datacenters globally,” said Chris Thomas , Chief Revenue Officer at AlgoSec. “We’re excited about our early 2025 successes and our evolving AlgoSec solutions which will help us meet our mission to enable the world’s most complex organizations to gain visibility, reduce risk and process changes. To hear first-hand AlgoSec’s strategic direction and product innovation roadmap, join us for our annual virtual AlgoSummit event on September 30.” To learn why over 2,200 of the world's most complex organizations trust AlgoSec to help secure their most critical workloads, visit www.algosec.com . About AlgoSec AlgoSec, a global cybersecurity leader, empowers organizations to securely accelerate application delivery up to 10 times faster by automating application connectivity and security policy across the hybrid network environment. With two decades of expertise securing hybrid networks, over 2200 of the world's most complex organizations trust AlgoSec to help secure their most critical workloads. AlgoSec Horizon platform utilizes advanced AI capabilities, enabling users to automatically discover and identify their business applications across multi-clouds, and remediate risks more effectively. It serves as a single source for visibility into security and compliance issues across the hybrid network environment, to ensure ongoing adherence to internet security standards, industry, and internal regulations. Additionally, organizations can leverage intelligent change automation to streamline security change processes, thus improving security and agility. Learn how AlgoSec enables application owners, information security experts, SecOps and cloud security teams to deploy business applications faster while maintaining security at www.algosec.com . MEDIA CONTACT: Megan Davis Alloy, on behalf of AlgoSec algosec@alloycrew.com

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