Win Update KB5030181 Cumulative Update .NET Framework 3.5, 4.8, and 4.8.1 (21H2)

September 12, 2023 - KB5030181 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 11, version 21H2​

Summary​

This article describes the security and Cumulative Update for 3.5, 4.8 and 4.8.1 for Windows 11, version 21H2.

Security Improvements

CVE-2023-36796 - .NET Framework Remote Code Execution Vulnerability
This security update addresses a vulnerability in DiaSymReader.dll when reading a corrupted PDB file which can lead to Remote Code Execution. For more information see CVE 2023-36796.

CVE-2023-36792 - .NET Framework Remote Code Execution Vulnerability
This security update addresses a vulnerability in DiaSymReader.dll when reading a corrupted PDB file which can lead to Remote Code Execution. For more information see CVE-2023-36792.

CVE-2023-36793 - .NET Framework Remote Code Execution Vulnerability
This security update addresses a vulnerability in DiaSymReader.dll when reading a corrupted PDB file which can lead to Remote Code Execution. For more information see CVE-2023-36793.

CVE-2023-36794 - .NET Framework Remote Code Execution Vulnerability
This security update addresses a vulnerability in DiaSymReader.dll when reading a corrupted PDB file which can lead to Remote Code Execution. For more information see CVE-2023-36794.

CVE-2023-36788 - .NET Framework Remote Code Execution Vulnerability
This security update addresses a vulnerability in the WPF XAML parser where an unsandboxed parser can lead to remote code execution. For more information see CVE 2023-36788.

Quality and Reliability Improvements

For a list of improvements that were released with this update, please see the article links in the Additional Information section of this article.

Known issues in this update​

Microsoft is not currently aware of any issues in this update.

Additional information about this update​

The following articles contain additional information about this update as it relates to individual product versions.

• 5029926 Description of the Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 11, version 21H2 (KB5029926)
• 5029920 Description of the Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 21H2 (KB5029920)

How to get this update​

Release Channel	Available	Next Step
Windows Update and Microsoft Update	Yes	None. This update will be downloaded and installed automatically from Windows Update.
Windows Update for Business	Yes	None. This update will be downloaded and installed automatically from Windows Update.
Microsoft Update Catalog	Yes	To get the standalone package for this update, go to the Microsoft Update Catalog website.
Windows Server Update Services (WSUS)	Yes	This operating system update will offer, as applicable, and individual .NET Framework product updates will be installed. For more information about individual .NET Framework product updates see additional information about this update section. This update will automatically sync with WSUS if you configure as follows: Product: Windows 11, version 21H2 Classification: Security Updates

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September 12, 2023-KB5030181 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 11, version 21H2 - Microsoft Support

support.microsoft.com

.NET Framework September 2023 Security and Quality Rollup Updates - .NET Blog

September 2023 Security and Quality Rollup Updates for .NET Framework.

devblogs.microsoft.com