February 9, 2021-KB4601056 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10, version 1909, and Windows Server, version 1909
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 is resolved in KB4601556. |
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 1909, and Windows Server, version 1909 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