Microsoft Net Framework 4.0 V 30319 Vulnerabilities Jun 2026

When a web server emits the header X-AspNet-Version: 4.0.30319 , it confirms the server runs the , but it does not specify whether the framework layer is the deprecated .NET 4.0 or a fully patched, modern version like .NET 4.8.

If your application targets a newer version (like 4.8) but the scanner reports 4.0.30319, you may already be protected by the latest security patches. Recommended Actions CVE-2024-51026 Detail - NVD microsoft net framework 4.0 v 30319 vulnerabilities

RCE vulnerabilities are the most severe, allowing attackers to run arbitrary code on the target system. In .NET 4.0, these often stem from flaws in how the framework deserializes data. When a web server emits the header X-AspNet-Version: 4

To check if your system is running a vulnerable version, you can inspect the Windows Registry: Navigate to it confirms the server runs the