Resolves a vulnerability in the Microsoft .NET Framework that could allow remote code execution when the .NET Framework fails to properly validate input before loading libraries. An attacker who successfully exploits this vulnerability could take control of an affected system. The attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

Introduction. This update for Windows 7 Service Pack 1 (SP1), Windows Server 2008 R2 SP1, and Windows Server 2008 Service Pack 2 (SP2) includes cumulative reliability improvements in .NET Framework 4.5.2.

- Improved deterministic output capability in ilasm.exe. Networking - Addresses an issue when Ssl negotiation can hang indefinitely when client certificates are used when TLS 1.3 is negotiated. Before the change renegotiation (PostHandshakeAuthentiction) would fail and SslStream or HttpWebRequest would observe timeout.

View products that this article applies to. Summary. This security update for the Microsoft .NET Framework resolves a security feature bypass vulnerability in which the .NET Framework (and the .NET Core) components don't completely validate certificates.

How to obtain and install the update Method 1: Windows Update. This update is available through Windows Update. When you turn on automatic updating, this update will be downloaded and installed automatically.

View products that this article applies to. Summary. This security update for the Microsoft .NET Framework resolves a security feature bypass vulnerability in which the .NET Framework (and the .NET Core) components don't completely validate certificates.

- Address crashes that could occur if ilasm.exe failed to establish temporary PDB file alongside the output file. 1 Windows Presentation Foundation (WPF) Additional information about this update. The following articles contain additional information about this update as it relates to individual product versions. 5020694 ...

- Improved deterministic output capability in ilasm.exe. Networking - Addresses an issue when Ssl negotiation can hang indefinitely when client certificates are used when TLS 1.3 is negotiated. Before the change renegotiation (PostHandshakeAuthentiction) would fail and SslStream or HttpWebRequest would observe timeout.

- Address crashes that could occur if ilasm.exe failed to establish temporary PDB file alongside the output file. 1 Windows Presentation Foundation (WPF) Additional information about this update. The following articles contain additional information about this update as it relates to individual product versions. 5018856 ...

Resolves a vulnerability in the Microsoft .NET Framework that could allow remote code execution when the .NET Framework fails to properly validate input before loading libraries. An attacker who successfully exploits this vulnerability could take control of an affected system. The attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.