Win Update KB5021090 Cumulative Update .NET Framework 3.5, 4.8, and 4.8.1 (21H2) - Dec. 13

Brink · Dec 13, 2022

December 13, 2022 - KB5021090 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 11

Summary
This article describes the Cumulative Update for 3.5, 4.8 and 4.8.1 for Windows 11.

Security Improvements

This security update addresses a vulnerability where restricted mode is triggered for the parsing of XPS files, preventing gadget chains which could allow remote code execution on an affected system. For more information please see CVE-2022-41089.

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

Symptom After installing this update, WPF apps may have a change in behavior. For more information about this issue, see KB5022083
Workaround To mitigate this issue, see KB5022083.

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

5020875 Description of the Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 11 (KB5020875)

5020882 Description of the Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11 (KB5020882)

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
Classification: Security Updates