You have multiple accounts
Choose the account you want to sign in with.

Release Date:
September 13, 2022

Version:
.NET Framework 3.5 and 4.8.1

The September 13, 2022 update for Microsoft server operating system version 21H2 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 an issue where an attacker could convince a local user to open a specially crafted file which could execute malicious code on an affected system. For more information please see CVE-2022-26929.

Quality and Reliability Improvements

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

Additional information about this update

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

  • 5017501 Description of the Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Microsoft server operating system version 21H2 (KB5017501)

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 update will automatically sync with WSUS if you configure Products and Classifications as follows:

Product: Microsoft server operating system version 21H2

Classification: Security Updates

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

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

What affected your experience?

Thank you for your feedback!

×