X-aspnet-version 4.0.3 Vulnerabilities Free Jun 2026

<outboundRules> <rule name="Remove X-AspNet-Version"> <match serverVariable="RESPONSE_X-AspNet-Version" pattern=".*" /> <action type="Rewrite" value="" /> </rule> </outboundRules>

Response.Headers.Remove("X-AspNet-Version"); x-aspnet-version 4.0.3 vulnerabilities

X-AspNet-Version: 4.0.3 is a for attackers targeting end-of-life ASP.NET applications. Removing the header via enableVersionHeader="false" is a simple but mandatory first step. However, due to the unsupported nature of .NET 4.0.3, organizations must prioritize migration to a supported .NET runtime. Relying solely on header suppression offers no protection against known remote code execution or padding oracle vulnerabilities. rule name="Remove X-AspNet-Version"&gt

Certain systems using this CLR version, such as NetAdmin IAM , have been found to allow attackers to steal and inject session cookies for unauthorized access. 3. The Risk of Information Disclosure action type="Rewrite" value="" /&gt