Invicti identified a version disclosure (Undertow Web Server) in the target web server's HTTP response. Undertow is a flexible performant web server written in java, providing both blocking and non-blocking API's based on NIO.

This information can help an attacker gain a greater understanding of the systems in use and potentially develop further attacks targeted at the specific version of Undertow Web Server.

An attacker might use the disclosed information to harvest specific security vulnerabilities for the version identified.

Configure your web server to prevent information leakage from the X-Powered-By header of its HTTP response.