Applies to:

Microsoft .NET Framework 3.5.1

IMPORTANT Verify that you have installed the required updates listed in the How to get this update section before installing this update. 

IMPORTANT Some customers who use Windows Server 2008 R2 SP1 and have activated their ESU multiple activation key (MAK) add-on before installing the January 14, 2020 updates might need to re-activate their key. Re-activation on the affected devices should only be required once.  For information on activation, see this blog post.

IMPORTANT WSUS scan cab files will continue to be available for Windows 7 SP1 and Windows Server 2008 R2 SP1. If you have a subset of devices running these operating systems without ESU, they might show as non-compliant in your patch management and compliance toolsets.

IMPORTANT Customers who have purchased the Extended Security Update (ESU) for on-premises versions of these operating systems must follow the procedures in KB4522133 to continue receiving security updates after extended support ends on January 14, 2020. For more information on ESU and which editions are supported, see KB4497181.

IMPORTANT Starting on January 15, 2020, a full-screen notification will appear that describes the risk of continuing to use Windows 7 Service Pack 1 after it reaches end of support on January 14, 2020. The notification will remain on the screen until you interact with it. This notification will only appear on the following editions of Windows 7 Service Pack 1:

Note The notification will not appear on domain-joined machines or machines in kiosk mode.

Summary

This security update addresses an issue where an unauthenticated attacker could cause a denial of service on an affected system. For more information please see CVE-2022-21911.

Known issues in this update

Microsoft is not currently aware of any issues in this update.

Additional information about this update

The following articles contain additional information about this update as it relates to individual product versions.

  • 5009711 Description of the Security Only Update for .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows 7 SP1 and Windows Server 2008 R2 SP1 (KB5009711)

How to obtain and install the update

Before installing this update

Prerequisite:

To apply this update, you must have .NET Framework 3.5.1 installed.

You must install the updates listed below and restart your device before installing the latest Rollup. Installing these updates improves the reliability of the update process and mitigates potential issues while installing the Rollup and applying Microsoft security fixes.

  1. The March 12, 2019 servicing stack update (SSU) (KB4490628). To get the standalone package for this SSU, search for it in the Microsoft Update Catalog. This update is required to install updates that are only SHA-2 signed.

  2. The latest SHA-2 update (KB4474419) released September 10, 2019. If you are using Windows Update, the latest SHA-2 update will be offered to you automatically. This update is required to install updates that are only SHA-2 signed. For more information on SHA-2 updates, see 2019 SHA-2 Code Signing Support requirement for Windows and WSUS.

  3. The Extended Security Updates (ESU) Licensing Preparation Package (KB4538483) released February 11, 2020. The ESU licensing preparation package will be offered to you from WSUS. To get the standalone package for ESU licensing preparation package, search for it in the Microsoft Update Catalog.

Install this update

Release Channel

Available

Next Step

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 7 Service Pack 1, Windows Server 2008 R2 Service Pack 1,Windows Embedded Standard 7 Service Pack 1, Windows Embedded POSReady 7

Classification: Security Updates

Restart requirement

You may need to 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.

Update deployment information

For deployment details for this security update, go to the following article in the Microsoft Knowledge Base:

20220111 Security update deployment information: January 11, 2022

Update removal information

Note We do not recommend that you remove any security update. To remove this update, use the Programs and Features item in Control Panel.

Update restart information

This update does not require a system restart after you apply it unless files that are being updated are locked or are being used.

File Information

File hash information

File name

SHA256 hash

Windows6.1-KB5008890-x64.msu

7972777F1C43164D3AFC7D41E89E37615FEECBD7305F964EFFA100568E11951B

Windows6.1-KB5008890-x86.msu

3240A56C8A49C38C34329A090F38A0ED5D738AC88A11EFE9BA0E8226931B522E

File name

File version

File size

Date

Time

Platform

SP requirement

Service branch

Aspnet_wp.exe

2.0.50727.8955

45,456

07-Dec-2021

01:25

x64

SPN

AMD64_NETFX-ASP

System.web.regularexpressions.dll

2.0.50727.8955

98,304

07-Dec-2021

01:25

x86

None

Not applicable

Webengine.dll

2.0.50727.8955

748,920

07-Dec-2021

01:25

x64

None

Not applicable

System.web.dll

2.0.50727.8955

5,300,224

07-Dec-2021

01:25

x64

None

Not applicable

System.web.regularexpressions.dll

2.0.50727.8955

98,304

07-Dec-2021

01:26

x86

None

Not applicable

Aspnet_wp.exe

2.0.50727.8955

33,680

07-Dec-2021

01:26

x86

SPN

X86_NETFX-ASP

Webengine.dll

2.0.50727.8955

439,696

07-Dec-2021

01:26

x86

None

Not applicable

System.web.dll

2.0.50727.8955

5,292,032

07-Dec-2021

01:26

x86

None

Not applicable

File name

File version

File size

Date

Time

Platform

SP requirement

Service branch

System.web.regularexpressions.dll

2.0.50727.8955

98,304

07-Dec-2021

01:26

x86

None

Not applicable

Aspnet_wp.exe

2.0.50727.8955

33,680

07-Dec-2021

01:26

x86

SPN

X86_NETFX-ASP

Webengine.dll

2.0.50727.8955

439,696

07-Dec-2021

01:26

x86

None

Not applicable

System.web.dll

2.0.50727.8955

5,292,032

07-Dec-2021

01:26

x86

None

Not applicable

Information about protection and security

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