UUSEC WAF

UUSEC WAF is an open-source web application firewall that runs on Linux using Nginx to filter and block malicious traffic. It provides protection against common threats like SQL injection, cross-site scripting (XSS), and file inclusion attacks. The project is developed by Safe3 and maintained on GitHub, with prebuilt packages available for Debian, Ubuntu, CentOS, and other distributions.

UUSEC WAF integrates directly with Nginx as a module, leveraging its event-driven architecture for minimal performance overhead. It supports custom rule sets, real-time log analysis, and automatic updates for threat signatures. The firewall can be tuned with different security levels and provides a web-based monitoring interface for traffic inspection. It also includes rate limiting capabilities to defend against brute-force and DDoS attacks.

This tool is ideal for sysadmins who need a self-hosted WAF without licensing costs. It is released under the MIT license and is free for any use, including commercial deployments. The project has an active community and regularly releases updates based on the latest vulnerabilities. Notable adoption includes use by Chinese cloud providers and financial institutions requiring low-level traffic inspection.