Ensure all Security and Quality Rollups for .NET Framework are installed. These address critical CVEs like CVE-2019-0613 (markup checking) and CVE-2019-0657 (URL parsing). Recommendation
There is no "silver bullet" for securing an unsupported runtime, but a layered approach can reduce risk: microsoft net framework 4.0 v 30319 vulnerabilities
Important (CVSS 6.8) Affected Components: System.Web.Configuration.MachineKey Ensure all Security and Quality Rollups for