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Release Date:
December 13, 2022

Version:
.NET Framework 3.5, 4.8 and 4.8.1

Note: Revised on Jun 20, 2023 to add resolution to known issue.

Summary

This article describes the Cumulative Update for 3.5, 4.8 and 4.8.1 for Windows 10 Version 21H1.

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.

Resolution

This issue has been resolved in the June 13, 2023 Security and Quality Rollup and Cumulative Update.

If you used any workaround or mitigations for this issue, they are no longer needed, and we recommend you remove them. To remove workaround review the workaround or alternative workaround which was applied for instructions. The workaround should be removed prior to installing the June update.

Additional information about this update

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

  • 5020872 Description of the Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 21H1 (KB5020872)

  • 5020881 Description of the Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 10 Version 21H1 (KB5020881)

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 10 Version 21H1

Classification: Security Updates

How to obtain help and support for this update

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