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5 Best Free and Open Source WAF for 2025

Web application security is evolving rapidly to address the growing and complex threats that organizations face. Here are some key trends expected in 2025:

  • Increased Sophistication of DDoS Attacks: Distributed Denial of Service (DDoS) attacks are becoming more advanced, with a significant rise in application-layer DDoS attacks. Businesses need robust mitigation strategies to handle these sophisticated threats.

  • Rapid Exploitation of Vulnerabilities: The speed at which hackers exploit vulnerabilities is accelerating. For instance, it can take as little as 22 minutes from the release of proof-of-concept (PoC) code for attackers to attempt to exploit a vulnerability. This necessitates real-time threat intelligence and automated security measures to stay ahead of attackers.

  • Growth in API Traffic and Shadow APIs: APIs represent a large portion of internet traffic, and the rise of shadow APIs (undocumented and unmanaged APIs) poses significant security risks. Ensuring comprehensive API security measures is crucial.

  • Rising Zero-Day Exploits: Zero-day vulnerabilities are increasing, posing a severe threat as they are exploited before developers can issue patches. Effective vulnerability management and swift patch deployment are essential.

  • Supply Chain Security: The use of third-party components like scripts and outbound connections introduces additional risks. Companies need to manage these third-party risks effectively to secure their web applications.

  • Bot Traffic: A substantial portion of internet traffic is generated by bots, with a high percentage being potentially malicious. Implementing effective bot management solutions is necessary to mitigate these threats.

  • Application Security Posture Management (ASPM): There is a growing need for ASPM solutions to help organizations maintain a secure application environment through continuous monitoring and risk assessment.

These trends highlight the critical areas where organizations need to focus their security efforts to protect web applications effectively.

A Web Application Firewall (WAF) is a useful security solution, designed to protect web applications by monitoring, filtering, and blocking HTTP/S traffic to and from a web application. It operates at the application layer (Layer 7 in the OSI model) and is designed to defend against a variety of attacks that can compromise web applications, such as SQL Injection, Cross-Site Scripting (XSS), Cross-Site Request Forgery (CSRF), File Inclusion, Malware, etc.

Here are the top open-source Web Application Firewalls (WAFs) to consider in 2025:

1.SafeLine

  • Description: SafeLine operates as a reverse proxy to protect web services from attacks. It uses intelligent semantic analysis algorithms, making it highly effective for community use.
  • GitHub Stars: 11.9K
  • Link: SafeLine on GitHub

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2.ModSecurity

  • Description: A widely-used open-source WAF that primarily provides a robust ruleset for protecting web applications. It requires customization and development to fully implement.
  • GitHub Stars: 8K
  • Link: ModSecurity on GitHub

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3.Awesome-WAF

  • Description: A comprehensive collection of WAFs, both open-source and commercial, along with related tools and resources. It's valuable for security professionals seeking various WAF solutions.
  • GitHub Stars: 6.1K
  • Link: Awesome-WAF on GitHub

4.BunkerWeb

  • Description: A next-generation WAF designed to make web services secure by default. It integrates well with environments like Linux, Docker, and Kubernetes.
  • GitHub Stars: 5.4K
  • Link: BunkerWeb on GitHub

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5.wafw00f

  • Description: A tool for identifying and fingerprinting WAFs protecting websites. It is widely used for security assessments and penetration testing.
  • GitHub Stars: 5.1K
  • Link: wafw00f on GitHub

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These WAFs provide robust security measures for web applications, helping to protect against a variety of web-based attacks. Each offers unique features and capabilities, making them suitable for different use cases and environments.
oai_citation:2,Top Open-Source WAF Projects: Secure Your Website with the Best Tools - DEV Community oai_citation:1,Top 23 Waf Open-Source Projects | LibHunt.

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