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A firewall that runs 24/7 requires a good amount of computing resources. Especially if you are running a complex firewall system, your... Firewall Change Management Firewall performance tuning: Common issues & resolutions Asher Benbenisty 2 min read Asher Benbenisty 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 8/9/23 Published A firewall that runs 24/7 requires a good amount of computing resources. Especially if you are running a complex firewall system, your performance overhead can actually slow down the overall throughput of your systems and even affect the actual functionalities of your firewall. Here is a brief overview of common firewall performance issues and the best practices to help you tune your firewall performance . 7 Common performance issues with firewalls Since firewall implementations often include some networking hardware usage, they can slow down network performance and traffic bottlenecks within your network. 1. High CPU usage The more network traffic you deal with, the more CPU time your server will need. When a firewall is running, it adds to CPU utilization since the processes need more power to execute the network packet analysis and subsequent firewall This may lead to firewall failures in extreme cases where the firewall process is completely shut down or the system experiences a noticeable lag affecting overall functionality. A simple way to resolve this issue would be to increase the hardware capabilities. But as that might not be a viable solution in all cases, you must consider minimizing the network traffic with router-level filtering or decreasing the server load with optimized 2. Route flapping Router misconfiguration or hardware failure can cause frequent advertising of alternate routes. This will increase the load on your resources and thus lead to performance issues. 3. Network errors and discards A high number of error packets or discarded packets can burden your resources as these packets are still processed by the firewall even when they ultimately turn out to be dud in terms of traffic. Such errors usually happen when routers try to reclaim some buffer space. 4. Congested network access link Network access link congestion can be caused due to a bottleneck happening between a high bandwidth IP Network and LAN. When there is high traffic, the router queue gets filled and causes jitters and time delays. When there are more occurrences of jitter, more packets are dropped on the receiving end, causing a degradation of the quality of audio or video being transmitted. This issue is often observed in VoIP systems . 5. Network link failure When packet loss continues for over a few seconds, it can be deemed a network link failure. While re-establishing the link could take just a few seconds, the routers may already be looking for alternate routes. Frequent network link failures can be a symptom of power supply or hardware issues. 6. Misconfigurations Software or hardware misconfigurations can easily lead to overloading of LAN, and such a burden can easily affect the system’s performance. Situations like these can be caused by misconfigured multicast traffic and can affect the overall data transfer rate of all users. 7. Loss of packets Loss of packets can cause timeout errors, retransmissions, and network slowness. Loss of packets can happen due to delayed operations, server slowdown, misconfiguration, and several other reasons. How to fine-Tune your firewall performance Firewall performance issues can be alleviated with hardware upgrades. But as you scale up, upgrading hardware at an increasing scale would mean high expenses and an overall inefficient system. A much better cost-effective way to resolve firewall performance issues would be to figure out the root cause and make the necessary updates and fixes to resolve the issues. Before troubleshooting, you should know the different types of firewall optimization techniques: Hardware updates Firewall optimization can be easily achieved through real-time hardware updates and upgrades. This is a straightforward method where you add more capacity to your computing resources to handle the processing load of running a firewall. General best practices This involves the commonly used universal best practices that ensure optimized firewall configurations and working. Security policies, data standard compliances , and keeping your systems up to date and patched will all come under this category of optimizations. Any optimization effort generally applied to all firewalls can be classified under this type. Vendor specific Optimization techniques designed specifically to fit the requirements of a particular vendor are called vendor-specific optimizations. This calls for a good understanding of your protected systems, how traffic flows, and how to minimize the network load. Model specific Similar to vendor-specific optimizations, model-specific optimization techniques consider the particular network model you use. For instance, the Cisco network models usually have debugging features that can slow down performance. Similarly, the PIX 6.3 model uses TCP intercept that can slow down performance. Based on your usage and requirements, you can turn the specific features on or off to boost your firewall performance. Best practices to resolve the usual firewall performance bottlenecks Here are some proven best practices to improve your firewall’s performance. Additionally, you might also want to read Max Power by Timothy Hall for a wholesome understanding. Standardize your network traffic Any good practice starts with rectifying your internal errors and vulnerabilities. Ensure all your outgoing traffic aligns with your cybersecurity standards and regulations. Weed out any application or server sending out requests that don’t comply with the security regulations and make the necessary updates to streamline your network. Router level filtering To reduce the load on your firewall applications and hardware, you can use router-level network traffic filtering. This can be achieved by making a Standard Access List filter from the previously dropped requests and then routing them using this list for any other subsequent request attempts. This process can be time-consuming but is simple and effective in avoiding bottlenecks. Avoid using complicated firewall rules Complex firewall rules can be resource heavy and place a lot of burden on your firewall performance. Simplifying this ruleset can boost your performance to a great extent. You should also regularly audit these rules and remove unused rules. To help you clean up firewall rules, you can start with Algosec’s firewall rule cleanup and performance optimization tool . Test your firewall Regular testing and auditing of your firewall can help you identify any probable causes for performance slowdown. You can collect information on your network traffic and use it to optimize how your firewall operates. You can use Algosec’s firewall auditor services to take care of all your auditing requirements and ensure compliance at all levels. Make use of common network troubleshooting tools To analyze the network traffic and troubleshoot your performance issues, you can use common network tools like netstat and iproute2. These tools provide you with network stats and in-depth information about your traffic that can be well utilized to improve your firewall configurations. You can also use check point servers and tools like SecureXL, and CoreXL. Follow a well-defined security policy As with any security implementation, you should always have a well-defined security policy before configuring your firewalls. This gives you a good idea of how your firewall configurations are made and lets you simplify them easily. Change management is also essential to your firewall policy management process . You should also document all the changes, reviews, and updates you make to your security policies to trace any problematic configurations and keep your systems updated against evolving cyber threats. A good way to mitigate security policy risks is to utilize AlgoSec. Network segmentation Segmentation can help boost performance as it helps isolate network issues and optimize bandwidth allocation. It can also help to reduce the traffic and thus further improve the performance. Here is a guide on network segmentation you can check out. Automation Make use of automation to update your firewall settings. Automating the firewall setup process can greatly reduce setup errors and help you make the process more efficient and less time-consuming. You can also extend the automation to configure routers and switches. Algobot is an intelligent chatbot that can effortlessly handle network security policy management tasks for you. Handle broadcast traffic efficiently You can create optimized rules to handle broadcast traffic without logging to improve performance. Make use of optimized algorithms Some firewalls, such as the Cisco Pix, ASA 7.0 , Juniper network models, and FWSM 4.0 are designed to match packets without dependency on rule order. You can use these firewalls; if not, you will have to consider the rule order to boost the performance. To improve performance, you should place the most commonly used policy rules on the top of the rule base. The SANS Institute recommends the following order of rules: Anti-spoofing filters User permit rules Management permit rules Noise drops Deny and alert Deny and log DNS objects Try to avoid using DNS objects that need DNS lookup services. This slows down the firewall. Router interface design Matching the router interface with your firewall interface is a good way to ensure good performance. If your router interface is half duplex and the firewall is full duplex, the mismatch can cause some performance issues. Similarly, you should try to match the switch interface with your firewall interface, making them report on the same speed and mode. For gigabit switches, you should set up your firewall to automatically adjust speed and duplex mode. You can replace the cables and patch panel ports if you cannot match the interfaces. VPN If you are using VPN and firewalls, you can separate them to remove some VPN traffic and processing load from the firewall and thus increase the performance. UTM features You can remove the additional UTM features like Antivirus, and URL scanning features from the firewall to make it more efficient. This does not mean you completely eliminate any additional security features. Instead, just offload them from the firewall to make the firewall work faster and take up fewer computing resources. Keep your systems patched and updated Always keep your systems, firmware, software, and third-party applications updated and patched to deal with all known vulnerabilities. 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

Understand HIPAA network compliance requirements. Learn how to safeguard patient data with robust network security measures and ensure compliance with HIPAA regulations. HIPAA network compliance & security requirements explained ---- ------- Schedule a Demo Select a size ----- Get the latest insights from the experts Use these six best practices to simplify compliance and risk mitigation with the AlgoSec platform White paper Learn how AlgoSec can help you pass PCI-DSS Audits and ensure continuous compliance Solution overview See how this customer improved compliance readiness and risk management with AlgoSec Case study Choose a better way to manage your network

With the rapid proliferation of cloud computing, lean deployment methods, such as containers, have become common practice. According to... Cloud Security Intro to Kubernetes Security Best Practices 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 11/27/20 Published With the rapid proliferation of cloud computing, lean deployment methods, such as containers, have become common practice. According to CIO.com, 70% of global companies are expected to be running multiple apps simultaneously using a containerized framework, like Kubernetes in the next few years. But as Kubernetes’ use becomes more widespread, so do the vulnerabilities inherent to containerization. According to a 2019 Forbes article , Kubernetes had at least 7,000 identified vulnerabilities at the beginning of 2019 alone. Couple that with the fact that cyber-attacks involving containerization have increased a whopping 240% since 2018, and you’ll understand the value of security should your company use a solution like Kubernetes to handle its container orchestration. What Causes Kubernetes Security Blindspots? To understand how to best optimize your Kubernetes experience, it’s worthwhile to understand the basic ways security issues arise in a containerized framework. Images are the core building blocks of containerization; they are the executable process at the centre of your container. As a result, anything that exposes an image to a broader audience puts the container at risk of being hijacked. One of the primary ways this occurs is by using out-of-date software. Using old software gives malicious actors a small incongruence that they can exploit within the code. Another problem is poorly defined user access roles. If sensible changes aren’t made to an orchestration tool’s default settings, inappropriate parties may have access to alter the container’s core executable. Containerization gives you a way to manage a large number of processes easily and with increased adaptability. As a result, automation makes it impossible to keep your eyes on everything at once. Here are some best practices that can help you counter the wide range of vulnerabilities inherent to containerization and Kubernetes in general. Kubernetes Security Best Practices Given the architecture of the Kubernetes framework, security risks are a constant and evolving threat. Luckily, Google made Kubernetes an open-source application under the auspices of the Cloud Native Computing Foundation where solutions to new security issues are actively crowdsourced by the community. Regardless, there are a number of things that you can do during the build, deployment, and runtime phases to make your Kubernetes implementation more secure. Take care of your images Images are the heart of every container. Executable functions are essential, so images must be well-maintained and in good working order. Only use up-to-date images, scanning them regularly for security issues. As a rule of thumb, you should also avoid including unnecessary tools and functions in your image coding as they can inadvertently give hackers an access route. Ensure that your secrets remain secret The term “secrets” refers to any private information such as login credentials, tokens, or other sensitive data. While it’s not customary to keep sensitive data stored adjacent to the container’s image, the scenario has come up before. Keep secret data as far from the image as possible in order to increase security. Keep up-to-date with scans and security patches The community does a good job of patching Kubernetes when issues arise. If you don’t take the time to update both your OS and Kubernetes’ security, you give malware additional avenues of attack. Updates should be performed at least every nine months, if not more often. Due to the nature of how Kubernetes works, if you are using an outdated version, you could actively be spreading issues when the container is deployed elsewhere. Take advantage of customization to define user roles and access A container orchestration tool like Kubernetes is a complex web running thousands of processes across numerous machines. That means hundreds of end-users involved with the application. Take advantage of Kubernetes administrative functions to clearly define user roles, limiting full access for those who don’t need it. As they say, too many cooks spoil the broth. Keeping Kubernetes Simple and Safe Containers are an agile, lightweight framework for cloud computing, but manually deploying the correct containers to their destinations can quickly become overwhelming. An orchestration tool like Kubernetes is the perfect solution to managing your containerization, but the security risks inherent to this model can be restrictive. By keeping a few key practices in mind when implementing Kubernetes into your workflow, you can help to promote safety while streamlining your processes. To Sum It All Up Kubernetes has become the centrepiece of the cloud Native landscape and a notable advantage for organizations to rapidly manage and deploy their containerized business logic. But certain security best practices must be followed such as working with reliable docker images, properly defined resource quotas, network policies, work with namespaces for access control and authentication\authorization, and more. To learn more about Prevasio integration and security for K8s containers, contact us today. 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

Making Risk Management Easier: How One Bank Got Smarter About Security Case Study Download PDF Download PDF Add a Title Add a Title Add a Title 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 Talk to a Skybox transition expert. Work email* First name* Last name* Company* country* Select country... Short answer* By submitting this form, I accept AlgoSec's privacy policy Continue

Automate network management and policy changes to increase efficiency, reduce errors, and ensure security compliance across your network infrastructure. Network management & policy change automation ---- ------- Schedule a Demo Select a size ----- Get the latest insights from the experts Choose a better way to manage your network

AlgoSec security management solution for Juniper Networks Solution Brief Download PDF Download PDF Add a Title Add a Title Add a Title 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 Talk to a Skybox transition expert. Work email* First name* Last name* Company* country* Select country... Short answer* By submitting this form, I accept AlgoSec's privacy policy Continue

In this webinar, Omer Ganot, AlgoSec’s Cloud Security Product Manager, and Stuti Deshpande s, Amazon Web Service’s Partner Solutions Architect, will share security challenges in the hybrid cloud and provide tips to protect your AWS and hybrid environment Webinars Overcoming hybrid environment management challenges | AWS & AlgoSec Webinar Public clouds such as Amazon Web Services (AWS) are a critical part of your hybrid network. It is important to keep out the bad guys (including untrusted insiders) and proactively secure your entire hybrid network. Securing your network is both the responsibility of the cloud providers, as well as your organization’s IT and CISOs – the shared responsibility model. As a result, your organization needs visibility into what needs to be protected, as well as an understanding of the tools that are available to keep them secure. In this webinar, Omer Ganot, AlgoSec’s Cloud Security Product Manager, and Stuti Deshpande’s, Amazon Web Service’s Partner Solutions Architect, will share security challenges in the hybrid cloud and provide tips to protect your AWS and hybrid environment, including how to: Securely migrate workloads from on-prem to public cloud Gain unified visibility into your network topology and traffic flows, including both public cloud and on-premises assets, from a single console. Manage/orchestrate multiple layers of security controls and proactively detect misconfigurations Protect your data, accounts, and workloads from misconfiguration risks Protect web applications in AWS by filtering traffic and blocking common attack patterns, such as SQL injection or cross-site scripting Gain a unified view of your compliance status and achieve continuous compliance September 30, 2020 Stuti Deshpande Partner Solution Architect, AWS Omer Ganot Product Manager Relevant resources Migrating Business Applications to AWS? Tips on Where to Start Keep Reading Tips for auditing your AWS security policies, the right way 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

Enterprise hybrid network management solutions Download PDF Download PDF Add a Title Add a Title Add a Title 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 Talk to a Skybox transition expert. Work email* First name* Last name* Company* country* Select country... Short answer* By submitting this form, I accept AlgoSec's privacy policy Continue

Security Policy Management with Professor Wool Advanced Cyber Threat and Incident Management Advanced Cyber Threat and Incident Management is a whiteboard-style series of lessons that examine some of the challenges and provide technical tips for helping organizations detect and quickly respond to cyber-attacks while minimizing the impact on the business. Lesson 1 SIEM solutions collect and analyze logs generated by the technology infrastructure, security systems and business applications. The Security Operations Center (SOC) team uses this information to identify and flag suspicious activity for further investigation. In this lesson, Professor Wool explains why it’s important to connect the information collected by the SIEM with other databases that provide information on application connectivity, in order to make informed decisions on the level of risk to the business, and the steps the SOC needs to take to neutralize the attack. How to bring business context into incident response Watch Lesson 2 In this lesson Professor Wool discusses the need for reachability analysis in order to assess the severity of the threat and potential impact of an incident. Professor Wool explains how to use traffic simulations to map connectivity paths to/from compromised servers and to/from the internet. By mapping the potential lateral movement paths of an attacker across the network, the SOC team can, for example, proactively take action to prevent data exfiltration or block incoming communications with Command and Control servers. Bringing reachability analysis into incident response Watch Have a Question for Professor Wool? Ask him now 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 Optimize your Juniper Investment with Intelligent Network Security Automation Are you maximizing all the capabilities that your Juniper solutions offer? Expand its potential and maximize your ROI. Discover how to secure your homogeneous and multi-vendor network with intelligent automation. In this webinar, Max Shirshov, EMEA Solutions Architect at AlgoSec, will demonstrate how to assess risk and audit the firewall estate for regulatory compliance, address security breaches caused by misconfigured network devices, and provide fast and efficient change management utilizing the AlgoSec Security Management solution for your Juniper devices. Join the webinar to learn how to: Gain complete visibility into your Juniper-estate as well as multi-vendor and hybrid networks Intelligently push security policy changes to your Netscreen and SRX firewalls, MX routers and Juniper Space, as well as other vendors’ security devices, SDN and public clouds Automate application and user aware security policy management and ensure your Juniper devices are properly configured Assess risk and ensure regulatory compliance across your entire enterprise environment March 24, 2020 Max Shirshov Relevant resources AlgoSec & Juniper Networks Keep Reading The Juniper Networks Vulnerability Does Not Change Network Security Fundamentals 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

Can Firewalls Be Hacked? Yes, Here’s 6 Vulnerabilities Like all security tools, firewalls can be hacked. That’s what happened to the... Cyber Attacks & Incident Response Can Firewalls Be Hacked? Yes, Here’s 6 Vulnerabilities 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 Can Firewalls Be Hacked? Yes, Here’s 6 Vulnerabilities Like all security tools, firewalls can be hacked. That’s what happened to the social media platform X in January 2023, when it was still Twitter. Hackers exploited an API vulnerability that had been exposed since June the previous year. This gave them access to the platform’s security system and allowed them to leak sensitive information on millions of users. This breach occurred because the organization’s firewalls were not configured to examine API traffic with enough scrutiny. This failure in firewall protection led to the leak of more than 200 million names, email addresses, and usernames, along with other information, putting victims at risk of identity theft . Firewalls are your organization’s first line of defense against malware and data breaches. They inspect all traffic traveling into and out of your network, looking for signs of cyber attacks and blocking malicious activity when they find it. This makes them an important part of every organization’s cybersecurity strategy. Effective firewall management and configuration is vital for preventing cybercrime. Read on to find out how you can protect your organization from attacks that exploit firewall vulnerabilities you may not be aware of. Understanding the 4 Types of Firewalls The first thing every executive and IT leader should know is that there are four basic types of firewalls . Each category offers a different level of protection, with simpler solutions costing less than more advanced ones. Most organizations need to use some combination of these four firewall types to protect sensitive data effectively. Keep in mind that buying more advanced firewalls is not always the answer. Optimal firewall management usually means deploying the right type of firewall for its particular use case. Ideally, these should be implemented alongside multi-layered network security solutions that include network detection and response, endpoint security, and security information and event management (SIEM) technology. 1. Packet Filtering Firewalls These are the oldest and most basic types of firewalls. They operate at the network layer, checking individual data packets for their source IP address and destination IP. They also verify the connection protocol, as well as the source port and destination port against predefined rules. The firewall drops packets that fail to meet these standards, protecting the network from potentially harmful threats. Packet filtering firewalls are among the fastest and cheapest types of firewalls available. Since they can not inspect the contents of data packets, they offer minimal functionality. They also can’t keep track of established connections or enforce rules that rely on knowledge of network connection states. This is why they are considered stateless firewalls. 2. Stateful Inspection Firewalls These firewalls also perform packet inspection, but they ingest more information about the traffic they inspect and compare that information against a list of established connections and network states. Stateful inspection firewalls work by creating a table that contains the IP and port data for traffic sources and destinations, and dynamically check whether data packets are part of a verified active connection. This approach allows stateful inspection firewalls to deny data packets that do not belong to a verified connection. However, the process of checking data packets against the state table consumes system resources and slows down traffic. This makes stateful inspection firewalls vulnerable to Distributed Denial-of-Service (DDoS) attacks. 3. Application Layer Gateways These firewalls operate at the application layer, inspecting and managing traffic based on specific applications or protocols, providing deep packet inspection and content filtering. They are also known as proxy firewalls because they can be implemented at the application layer through a proxy device. In practice, this means that an external client trying to access your system has to send a request to the proxy firewall first. The firewall verifies the authenticity of the request and forwards it to an internal server. They can also work the other way around, providing internal users with access to external resources (like public web pages) without exposing the identity or location of the internal device used. 4. Next-Generation Firewalls (NGFW) Next-generation firewalls combine traditional firewall functions with advanced features such as intrusion prevention, antivirus, and application awareness . They contextualize data packet flows and enrich them with additional data, providing comprehensive security against a wide range of threats. Instead of relying exclusively on IP addresses and port information, NGFWs can perform identity-based monitoring of individual users, applications, and assets. For example, a properly configured NGFW can follow a single user’s network traffic across multiple devices and operating systems, providing an activity timeline even if the user switches between a desktop computer running Microsoft Windows and an Amazon AWS instance controlling routers and iOT devices. How Do These Firewalls Function? Each type of firewall has a unique set of functions that serve to improve the organization’s security posture and prevent hackers from carrying out malicious cyber attacks. Optimizing your firewall fleet means deploying the right type of solution for each particular use case throughout your network. Some of the most valuable functions that firewalls perform include: Traffic Control They regulate incoming and outgoing traffic, ensuring that only legitimate and authorized data flows through the network. This is especially helpful in cases where large volumes of automated traffic can slow down routine operations and disrupt operations. For example, many modern firewalls include rules designed to deny bot traffic. Some non-human traffic is harmless, like the search engine crawlers that determine your website’s ranking against certain keyword searches. However, the vast majority of bot traffic is either unnecessary or malicious. Firewalls can help you keep your infrastructure costs down by filtering out connection attempts from automated sources you don’t trust. Protection Against Cyber Threats Firewalls act as a shield against various cyber threats, including phishing attacks, malware and ransomware attacks . Since they are your first line of defense, any malicious activity that targets your organization will have to bypass your firewall first. Hackers know this, which is why they spend a great deal of time and effort finding ways to bypass firewall protection. They can do this by exploiting technical vulnerabilities in your firewall devices or by hiding their activities in legitimate traffic. For example, many firewalls do not inspect authenticated connections from trusted users. If cybercriminals learn your login credentials and use your authenticated account to conduct an attack, your firewalls may not notice the malicious activity at all. Network Segmentation By defining access rules, firewalls can segment networks into zones with varying levels of trust, limiting lateral movement for attackers. This effectively isolates cybercriminals into the zone they originally infiltrated, and increases the chance they make a mistake and reveal themselves trying to access additional assets throughout your network. Network segmentation is an important aspect of the Zero Trust framework. Firewalls can help reinforce the Zero Trust approach by inspecting traffic traveling between internal networks and dropping connections that fail to authenticate themselves. Security Policy Enforcement Firewalls enforce security policies, ensuring that organizations comply with their security standards and regulatory requirements. Security frameworks like NIST , ISO 27001/27002 , and CIS specify policies and controls that organizations need to implement in order to achieve compliance. Many of these frameworks stipulate firewall controls and features that require organizations to invest in optimizing their deployments. They also include foundational and organizational controls where firewalls play a supporting role, contributing to a stronger multi-layered cybersecurity strategy. Intrusion Detection and Prevention Advanced firewalls include intrusion detection and prevention capabilities, which can identify and block suspicious activities in real-time. This allows security teams to automate their response to some of the high-volume security events that would otherwise drag down performance . Automatically detecting and blocking known exploits frees IT staff to spend more time on high-impact strategic work that can boost the organization’s security posture. Logging and Reporting Firewalls generate logs and reports that assist in security analysis, incident response, and compliance reporting. These logs provide in-depth data on who accessed the organization’s IT assets, and when the connection occurred. They enable security teams to conduct forensic investigations into security incidents, driving security performance and generating valuable insights into the organization’s real-world security risk profile. Organizations that want to implement SIEM technology must also connect their firewall devices to the platform and configure them to send log data to their SIEM for centralized analysis. This gives security teams visibility into the entire organization’s attack surface and enables them to adopt a Zero Trust approach to managing log traffic. Common Vulnerabilities & Weaknesses Firewalls Share Firewalls are crucial for network security, but they are not immune to vulnerabilities. Common weaknesses most firewall solutions share include: Zero-day vulnerabilities These are vulnerabilities in firewall software or hardware that are unknown to the vendor or the general public. Attackers can exploit them before patches or updates are available, making zero-day attacks highly effective. Highly advanced NGFW solutions can protect against zero-day attacks by inspecting behavioral data and using AI-enriched analysis to detect unknown threats. Backdoors Backdoors are secret entry points left by developers or attackers within a firewall’s code. These hidden access points can be exploited to bypass security measures. Security teams must continuously verify their firewall configurations to identify the signs of backdoor attacks. Robust and effective change management solutions help prevent backdoors from remaining hidden. Header manipulation Attackers may manipulate packet headers to trick firewalls into allowing unauthorized traffic or obscuring their malicious intent. There are multiple ways to manipulate the “Host” header in HTTP traffic to execute attacks. Security teams need to configure their firewalls and servers to validate incoming HTTP traffic and limit exposure to header vulnerabilities. How Cyber Criminals Exploit These Vulnerabilities Unauthorized Access Exploiting a vulnerability can allow cybercriminals to penetrate a network firewall, gaining access to sensitive data, proprietary information, or critical systems. Once hackers gain unauthorized access to a network asset, only a well-segmented network operating on Zero Trust principles can reliably force them to reveal themselves. Otherwise, they will probably remain hidden until they launch an active attack. Data Breaches Once inside your network, attackers may exfiltrate sensitive information, including customer data, intellectual property, and financial records (like credit cards), leading to data breaches. These complex security incidents can lead to major business disruptions and reputational damage, as well as enormous recovery costs. Malware Distribution Attackers may use compromised firewalls to distribute malware, ransomware, or malicious payloads to other devices within the network. This type of attack may focus on exploiting your systems and network assets, or it may target networks adjacent to your own – like your third-party vendors, affiliate partners, or customers. Denial of Service (DDoS) Exploited firewalls can be used in DDoS attacks, potentially disrupting network services and rendering them unavailable to users. This leads to expensive downtime and reputational damage. Some hackers try to extort their victims directly, demanding organizations pay money to stop the attack. 6 Techniques Used to Bypass Firewalls 1. Malware and Payload Delivery Attackers use malicious software and payloads to exploit firewall vulnerabilities, allowing them to infiltrate networks or systems undetected. This often occurs due to unpatched security vulnerabilities in popular firewall operating systems. For example, in June 2023 Fortinet addressed a critical-severity FortiOS vulnerability with a security patch. One month later in July, there were still 300,000 Fortinet firewalls still using the unpatched operating system. 2. Phishing Attacks Phishing involves tricking individuals into divulging sensitive information or executing malicious actions. Attackers use deceptive emails or websites that may bypass firewall filters. If they gain access to privileged user account credentials, they may be able to bypass firewall policies entirely, or even reconfigure firewalls themselves. 3. Social Engineering Tactics Cybercriminals manipulate human psychology to deceive individuals into disclosing confidential information, effectively bypassing technical security measures like firewalls. This is typically done through social media, email, or by telephone. Attackers may impersonate authority figures both inside and outside the organization and demand access to sensitive assets without going through the appropriate security checks. 4. Deep Packet Inspection Evasion Attackers employ techniques to disguise malicious traffic, making it appear benign to firewalls using deep packet inspection, allowing it to pass through undetected. Some open-source tools like SymTCP can achieve this by running symbolic executions on the server’s TCP implementation, scanning the resulting execution paths, and sending malicious data through any handling discrepancies identified. 5. VPNs and Remote Access Attackers may use Virtual Private Networks (VPNs) and remote access methods to circumvent firewall restrictions and gain unauthorized entry into networks. This is particularly easy in cases where simple geo restrictions block traffic from IP addresses associated with certain countries or regions. Attackers may also use more sophisticated versions of this technique to access exposed services that don’t require authentication, like certain containerized servers . 6. Intrusion Prevention Systems (IPS) Bypass Sophisticated attackers attempt to evade IPS systems by crafting traffic patterns or attacks that go undetected, enabling them to compromise network security. For example, they may use technologies to decode remote access tool executable files hidden inside certificate files, allowing them to reassemble the malicious file after it passes through the IPS. Protecting Against Firewall Vulnerabilities Multi-factor Authentication (MFA) MFA adds an extra layer of security by requiring users to provide multiple forms of identification, such as a password and a one-time code sent to their mobile device, before they gain access. This prevents attackers from accessing sensitive network assets immediately after stealing privileged login credentials. Knowing an account holder’s password and username is not enough. Two-factor Authentication (2FA) 2FA is a subset of MFA that involves using two authentication factors, typically something the user knows (password) and something the user has (a mobile device or security token), to verify identity and enhance firewall security. Other versions use biometrics like fingerprint scanning to authenticate the user. Intrusion Prevention Systems (IPS) IPS solutions work alongside firewalls to actively monitor network traffic for suspicious activity and known attack patterns, helping to block or mitigate threats before they can breach the network. These systems significantly reduce the amount of manual effort that goes into detecting and blocking known malicious attack techniques. Web Application Firewalls (WAF) WAFs are specialized firewalls designed to protect web applications from a wide range of threats, including SQL injection, cross-site scripting (XSS), and other web-based attacks. Since these firewalls focus specifically on HTTP traffic, they are a type of application level gateway designed specifically for web applications that interact with users on the public internet. Antivirus Software and Anti-malware Tools Deploying up-to-date antivirus and anti-malware software on endpoints, servers, and Wi-Fi network routers helps detect and remove malicious software, reducing the risk of firewall compromise. In order to work effectively, these tools must be configured to detect and mitigate the latest threats alongside the organization’s other security tools and firewalls. Automated solutions can help terminate unauthorized processes before attackers get a chance to deliver malicious payloads. Regular Updates and Patch Management Keeping firewalls and all associated software up-to-date with the latest security patches and firmware updates is essential for addressing known vulnerabilities and ensuring optimal security. Security teams should know when configuration changes are taking place, and be equipped to respond quickly when unauthorized changes take place. Implementing a comprehensive visibility and change management platform like AlgoSec makes this possible. With AlgoSec, you can simulate the effects of network configuration changes and proactively defend against sophisticated threats before attackers have a chance to strike. Monitoring Network Traffic for Anomalies Continuous monitoring of network traffic helps identify unusual patterns or behaviors that may indicate a security incident. Anomalies can trigger alerts for further investigation and response. Network detection and response solutions grant visibility into network activities that would otherwise go unnoticed, potentially giving security personnel early warning when unannounced changes or suspicious behaviors take place. Streamline Your Firewall Security With AlgoSec Organizations continue to face increasingly sophisticated cyber threats, including attacks that capitalize on misconfigured firewalls – or manipulate firewall configurations directly. Firewall management software has become a valuable tool for maintaining a robust network security posture and ensuring regulatory compliance. AlgoSec plays a vital role enhancing firewall security by automating policy analysis, optimizing rule sets, streamlining change management, and providing real-time monitoring and visibility. Find out how to make the most of your firewall deployment and detect unauthorized changes to firewall configurations with our help. 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... 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