Note
Revised July 8, 2025: Updated 'How to get this update' section.
Note
- Release Date:
January 14, 2025 - Version:
.NET Framework 3.5 and 4.8.1
The January 14, 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
CVE-2025-21176 - .NET Framework Remote Code Execution vulnerability
This security update addresses a remote code execution vulnerability detailed in CVE-2025-21176.
Quality and Reliability Improvements
| .NET Runtime | - Addresses an issue where in rare cases where an infinite loop could occur when a thread enters CLR for the first time. |
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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 | 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 as follows: Product: Windows 11, version 22H2 and Windows 11, version 23H2 Classification: Security Updates |
Note: This update is no longer available on Windows Update. It is still available on Microsoft Update Catalog and Windows Server Update Services (WSUS). 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