ModSecurity is an open source web application firewall (WAF) module that can run as an Apache module or as a standalone application. It can be used to protect web applications from various types of attacks by filtering and monitoring incoming HTTP traffic requests. ModSecurity can be configured to detect specific patterns in the request or response and block or log if identified as an attack pattern. It also offers a flexible rules engine that allows administrators to create custom rules tailored to the specific needs of the web application.
