© 2026 — The Shelf
The "x-aspnet-version 4.0.3" header, often revealed in web server responses, indicates that a server is running ASP.NET version 4.0.3. While this information might seem innocuous, it can be exploited by malicious actors to identify potential targets for attacks, given that older versions of ASP.NET, including 4.0.3, are known to have vulnerabilities.
: Some specific systems running on CLR 4.0.30319, such as the NetAdmin IAM system, have had unique vulnerabilities (e.g., CVE-2024-51026 ) reported recently. National Institute of Standards and Technology (.gov) +7 Remediation Steps To align with security best practices and "defense-in-depth" principles, you should disable the version disclosure. StackHawk Documentation 11 sites X-AspNet-Version Response Header Scanner These headers reveal the version of the ASP.NET or ASP.NET MVC framework being used by the server. Attackers can exploit this vuln... StackHawk Documentation Version Disclosure (ASP.NET) - Vulnerabilities - Acunetix Description. This web application exposes ASP.NET framework version information through the X-AspNet-Version HTTP response header ... Acunetix CVE-2024-51026 Detail - NVD Nov 11, 2024 —
<system.web> <httpRuntime enableVersionHeader="false" /> </system.web>
The "x-aspnet-version 4.0.3" header, often revealed in web server responses, indicates that a server is running ASP.NET version 4.0.3. While this information might seem innocuous, it can be exploited by malicious actors to identify potential targets for attacks, given that older versions of ASP.NET, including 4.0.3, are known to have vulnerabilities.
: Some specific systems running on CLR 4.0.30319, such as the NetAdmin IAM system, have had unique vulnerabilities (e.g., CVE-2024-51026 ) reported recently. National Institute of Standards and Technology (.gov) +7 Remediation Steps To align with security best practices and "defense-in-depth" principles, you should disable the version disclosure. StackHawk Documentation 11 sites X-AspNet-Version Response Header Scanner These headers reveal the version of the ASP.NET or ASP.NET MVC framework being used by the server. Attackers can exploit this vuln... StackHawk Documentation Version Disclosure (ASP.NET) - Vulnerabilities - Acunetix Description. This web application exposes ASP.NET framework version information through the X-AspNet-Version HTTP response header ... Acunetix CVE-2024-51026 Detail - NVD Nov 11, 2024 —
<system.web> <httpRuntime enableVersionHeader="false" /> </system.web>
© 2026 — The Shelf