Win Update KB5028575 Cumulative Update .NET Framework 4.8.1 for Windows 11 (21H2)

June 22, 2023 - KB5028575 Update for .NET Framework 4.8.1 for Windows 11, version 21H2​

The June 22, 2023 update for Windows 11, version 21H2 includes improvements in .NET Framework 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

There are no new security improvements in this release.

Quality and Reliability Improvements

CLR1

This update addresses a change that affects how you use the X509Certificate, X509Certificate2, or X509Certificate2Collection classes. When you use them to import a PKCS#12 blob that contains a private key, the calling application might get an exception. The exception message is, “System.Security.Cryptography.CryptographicException: PKCS12 (PFX) without a supplied password has exceeded maximum allowed iterations. See KB5025823 Change in how .NET applications import X.509 certificates - Microsoft Support for more information.” To learn more, seeKB5028608.

1Common Language Runtime (CLR)

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	No	See the other options below.
Windows Update for Business	No	See the other options below.
Microsoft Update Catalog	Yes	To get the standalone package for this update, go to the Microsoft Update Catalog website.
Windows Server Update Services (WSUS)	No	You can import this update into WSUS manually. See the Microsoft Update Catalog for instructions.

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 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.

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June 22, 2023-KB5028575 Update for .NET Framework 4.8.1 for Windows 11, version 21H2 - Microsoft Support

support.microsoft.com

KB5028608 Change in how .NET Framework runtime imports X.509 Certificates - Microsoft Support

support.microsoft.com