April 8, 2025-KB5054980 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 22H2 and Windows 11, version 23H2
Applies To
.NETRevised July 7, 2025: Updated 'How to get this update' section.Â
IMPORTANT
This update was originally released in the Security and Quality Rollup that’s dated April 8, 2025. This update is included in the Security and Quality Rollup that’s dated April 8, 2025. There is no change to this update with this release on April 8, 2025. If you have previously installed this update no action is needed.
Release Date:April 8, 2025
Version: .NET Framework 3.5 and 4.8.1
The March 25, 2025 update for Windows 11, version 22H2 and Windows 11, version 23H2 includes security and 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
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 Fundamentals |
- Addresses an issue where System.IO APIs are used to operate on files and directories on UNC shares. |
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 note |
|
Windows Update for Business |
No |
See note |
|
Microsoft Update Catalog |
No |
See note |
|
Windows Server Update Services (WSUS) |
No |
See note |
Note: This update is no longer available. At this time, no functional issues have been reported with this update. To ensure your device continues to receive the latest security updates and quality improvements, we recommend installing the most recent cumulative update.
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
-
Help for installing updates: Windows Update FAQ
-
Protect yourself online and at home: Windows Security support
-
Local support according to your country: International Support
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