Applies To.NET

Release Date:December 13, 2022

Version: .NET Framework 3.5 and 4.8.1

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

The December 13, 2022 update for Windows Server 2022 includes cumulative reliability improvements in .NET Framework 3.5 and 4.8.1. We recommend that you apply this update as part of your regular maintenance routines. Before you install this update, see the Prerequisites and Restart requirement sections.

Summary

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

There are no new Quality and Reliability Improvements in this update.

Additional information about this update

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

  • 5021095 Description of the Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows Server 2022 (KB5021095)

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.

How to get this update

Install 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 individual .NET Framework product update will be installed, as applicable, by applying the operating system update. For more information about operating system updates see additional information about this update section.

File information

For a list of the files that are provided in this update, download the file information for cumulative update.

Prerequisites

To apply this update, you must have .NET Framework 3.5 or 4.8.1 installed.

Restart requirement

You must restart the computer after you apply this update if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this update.

How to obtain help and support for this update

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