Release Date:August 13, 2024

Version: .NET Framework 3.5 and 4.8

The August 13, 2024 update for Windows 11, version 21H2 includes security and cumulative reliability improvements in .NET Framework 3.5 and 4.8. 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

There are no new security improvements in this release. This update is cumulative and contains all previously released security improvements.

Quality and Reliability Improvements

.NET Libraries

- Addresses an issue to update zlib file to latest version.

.NET Fundamentals

- Addresses an issue to render UI automation ListView sub items.

- Addresses an issue with bypass serialization binder with binary formatter mutations.

- Addresses an issue to remove meta tag information referencing "Recreational Software Advisory Council" and the content-rating schema from ASP.Net WebForms SmartNavigation feature.

- Addresses an issue .NET Framework interaction with Visual Studio to avoid conflicts between design-time and debug/runtime compilation of some .NET Framework ASP.NET project that could result in slowed developer experience for large projects.

Additional information about this update

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

  • 5042353 Description of the Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 11, version 21H2 (KB5042353)

Known issues in this update

Microsoft is not currently aware of any issues in this 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 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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