Response.Headers.Remove("X-AspNetMvc-Version");

Abstract: The X-AspNetMvc-Version HTTP header is a custom response header automatically injected by ASP.NET MVC frameworks. While intended to aid debugging and runtime environment identification, this header constitutes a form of information disclosure that can aid malicious actors in reconnaissance. This paper examines the header’s origin, technical function, associated security risks, and industry-standard mitigation techniques.

The X-AspNetMvc-Version header offers no operational value to end users and actively contributes to information leakage. Organizations deploying ASP.NET MVC should adopt header stripping as a standard hardening measure, aligning with principles of minimizing attack surface. The act of removal does not patch vulnerabilities but frustrates automated scanning and low-effort reconnaissance.

<system.webServer> <httpProtocol> <customHeaders> <remove name="X-AspNetMvc-Version" /> </customHeaders> </httpProtocol> </system.webServer> (Note: Method 3 does not always work for MVC-added headers; methods 1 or 2 are preferred.) After removal, a security assessment can confirm absence: