protected void Application_Start()
Helping developers identify the environment during troubleshooting. x-aspnetmvc-version
An attacker seeing X-AspNetMvc-Version: 4.0 can immediately cross-reference public exploit databases or tailor payloads for that exact version. While not a direct vulnerability, this header reduces the “security by obscurity” layer and accelerates targeted attacks. x-aspnetmvc-version
x-aspnetmvc-version is a response header that is sent by ASP.NET MVC applications. It contains a string value that indicates the version of ASP.NET MVC being used by the application. x-aspnetmvc-version
While X-AspNetMvc-Version is controlled by the MVC handler, other related headers like X-AspNet-Version or X-Powered-By are removed via the web.config file: