February 9, 2021-KB4601050 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, and Windows Server, version 20H2
Applies To
.NETRelease Date:
February 9, 2021Version:
.NET Framework 3.5 and 4.8Summary
This security update addresses a denial of service vulnerability in .NET Framework. For more information please see CVE-2021-24111.
Known issues in this update
Symptom |
After installing this update, WPF apps may crash with a callstack similar to
This occurs when disposing an HwndSource whose RootVisual is null, a situation that arises in Visual Studio when docking or splitting windows, and could arise in other apps. |
Workaround |
This issue was resolved in KB4601554. |
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. |
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: Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, and Windows Server, version 20H2 Classification: Security Updates |
File information
For a list of the files that are provided in this update, download the file information for cumulative update.
Information about protection and security
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Protect yourself online: Windows Security support
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Learn how we guard against cyber threats: Microsoft Security