August 8, 2023-KB5029648 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 10 Version 21H2

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Note

Revised on August 13th, 2023 to add a known issue.

Note

  • Release Date:
    August 8, 2023
  • Version:
    .NET Framework 3.5, 4.8 and 4.8.1

Summary

This article describes the security and Cumulative Update for 3.5, 4.8 and 4.8.1 for Windows 10 Version 21H2.

Security Improvements

CVE-2023-36899 - .NET Framework Remote Code Execution Vulnerability
              This security update addresses a vulnerability in applications on IIS using their parent application’s Application Pool which can lead to privilege escalation or other security bypasses. For more information see CVE 2023-36899.

CVE-2023-36873 - .NET Framework Spoofing Vulnerability
                This security update addresses a vulnerability where unauthenticated remote attacker can sign ClickOnce deployments without a valid code signing certificate. For more information see CVE-2023-36873.

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 windows KB5029244, applications which were deployed using ClickOnce might begin to prompt for installation even when the ClickOnce apps are already installed and marked as “trusted”.
Resolution To mitigate the issue, see Windows 10, version 21H2 resolved issues.

Additional information about this update

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

  • 5028951 Description of the Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 21H2 and Windows 10 Version 22H2 (KB5028951)
  • 5028946 Description of the Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 10 Version 21H2 and Windows 10 Version 22H2 (KB5028946)

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 21H2
Classification: Security Updates

How to obtain help and support for this update