Microsoft Net Framework 4.0 V 30319 Vulnerabilities _best_ Jun 2026

Microsoft .NET Framework 4.0 (specifically build v4.0.30319 considered highly vulnerable because it reached End of Life on January 12, 2016

The most severe vulnerability of .NET Framework 4.0 is not a CVE—it is . Microsoft ended mainstream support for .NET 4.0 on January 12, 2016 , and extended support ended on October 11, 2016 . While later versions (4.5, 4.6, 4.8) supersede it, many legacy applications still specifically reference or rely on the original 4.0.30319 runtime. microsoft net framework 4.0 v 30319 vulnerabilities

One notable historical vulnerability in this category involved the way .NET handled XML signatures. By exploiting flaws in the validation process, attackers could bypass security checks and gain unauthorized access to system resources. Denial of Service Weaknesses Microsoft

Multiple vulnerabilities (e.g., CVE-2015-2504) allow attackers to inject malicious web scripts or HTML into pages processed by the framework. 2016 . While later versions (4.5