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Notes: 

  • Revised 3/29/2023 to add an resolution to a Known issues in this update.

  • Revised 3/24/2023 to add an additional Known issues in this update.

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

Release Date:
February 14, 2023

Version:
.NET Framework 3.5 and 4.8.1

The February 14, 2023 update for Windows 10, version 20H2, Windows 10 Version 21H2 and Windows 10 Version 22H2 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

CVE-2023-21808 - .NET Framework Remote Code Execution Vulnerability
This security update addresses a vulnerability in the MSDIA SDK where an untrusted pointer dereference can cause memory corruption, leading to a crash or remove code execution. For more information please see CVE-2023-21808.

CVE-2023-21722 - .NET Framework Denial of Service Vulnerability
This security update addresses a vulnerability where the Visual Studio WMI Setup Provider Installer can be used by a low level, local attacker to corrupt local files that SYSTEM can writ to, leading to a potential denial of service. For more information please see CVE-2023-21722.

Quality and Reliability Improvements

WPF1

- Addresses an issue in propagation of ElementHost controls Visible property to underlying HwndWrapper.

- Addresses an issue that restores System.Windows.Controls.VirtualizingStackPanel scrolling behavior for CollectionChange event.

- Addresses an issue to ignore Win32LastError when calling GetWindowText and GetWindowTextLength methods.

- Addresses an issue to allow override the control to always have IsOpen property set to false for third party library created class using the ToolTip class as the base.

Networking

- Addresses an issue in the Socket.EndReceiveFrom method that may lead to AccessViolationException in rare scenarios.

1Windows Presentation Foundation (WPF)

Additional information about this update

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

  • 5022728 Description of the Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 10 Version 21H2 (KB5022728)

  • 5022727 Description of the Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 10, version 20H2 (KB5022727)

  • 5022729 Description of the Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 10 Version 22H2 (KB5022729)

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.

Symptom

The .NET Framework 4.8.1 February cumulative update, KB5022498 will not install. This is an issue only occurs after installing the .NET Framework 4.8 February cumulative update, KB5022502, then upgrading to .NET Framework 4.8.1 then scanning for updates.

Workaround

Applying the following steps will allow KB5022498to be installed:

  • Uninstall 4.8 February update (KB5022502 )

  • Run command from elevated Command Promp: dism/online /cleanup-image /StartComponentCleanup

  • Scan for windows update again, 4.8.1 February update (KB5022498) installs as expected.

Resolution

On March 29, 2023, KB5022498 was re-released to correct this issue.

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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