Windows 10 KB5009543 and KB5010793 for January Updates

The January security update for Windows 10 workstations was initially released on 11th January 2022. Subsequent to the VPN issues that affected Windows 10 based clients, Microsoft released an out of band update KB5010793 for Windows 10 version 20H2, 21H1, and 21H2. We cover, in detail, the issues that resulted on Windows 10 systems after deploying KB5009543. We also look at the various ways in which you can install the KB5010793 update on Windows 10.

Emergency Update KB5010793 for Windows 10 20H2, 21H1 and 21H2

Emergency update KB5010793 covers Windows 10 based client computers on a network. The update seeks to resolve the failed VPN connections coming out of the Windows 10 client computers to a remote VPN host. You may receive errors corresponding to the L2TP security policy or any other VPN errors. Specifically, KB5010793 looks into fixing the VPN errors.

The best way around this issue is to uninstall the problem causing KB5009543 security update and install the KB5010793 update for Windows 10 computers. Updating the computer will work as well as patching it with KB5009543, without breaking the VPN connections through the Windows 10 based client computers to a VPN host. If you do not work with VPN connections or do not connect to a VPN host through the Windows 10 computer, you can choose to continue with the security update KB5009543.

The suggested approach would be to patch Windows 10 version 20H2, 21H1, and 21H2 with KB5010793.

How to get KB5010793 for Windows 10 20H2, 21H1, and 21H2?

KB5010793 update requires manual attention. It is in the nature of an emergency update.

  • Download KB5010793 for Windows 10 from the Microsoft Update catalog on this page. Downloads are available for x64 based AMD64 processors, x86 and ARM64 processors. Please choose the download that corresponds to your processor type and the Windows 10 version.
  • KB5010793 is also available as an optional update and can be patched using Windows 10 update.
  • KB5010793 can be manually imported into WSUS or Windows Server Update Service.
  • x64 based KB5010793 update weighs 648.6 MB. This is across all the Windows 10 version 20H2, 21H1 and 21H2.
  • x86 based KB5010793 weighs 304.7 MB. This is across all the Windows 10 version 20H2, 21H1 and 21H2.
  • x64 ARM based KB5010793 weighs 680.7 MB. This is across all the Windows 10 version 20H2, 21H1 and 21H2.

If you compare the size of KB5010793 and KB5009543 for Windows 10 version 20H2, 21H1, and 21H2, you will notice that the size of the update files is almost similar for a file to file comparison. Effectively, both updates are identical with the obvious resolution of VPN issues in the KB5010793.

Other issues resolved in KB5010793

Aside from the VPN issue resolved in Windows 10 based computers through KB5010793, there are a few other issues that have been taken care of in the KB5010793 patch. These issues are mentioned in a summarized way.

  • Missing Microsoft Edge Legacy and a missing automatically installed version of Microsoft Edge on the Windows 10 computers. You can directly install Microsoft Edge on Windows 10 from the Microsoft site.
  • PSFX_E_MATCHING_BINARY_MISSING after patching with June update KB5003690. This issue prevents you from installing updates on the Windows 10 computer. KB5005322 provides resolution of this issue.
  • Failure to authenticate using smart cards for the Remote Desktop connection. Resolution lies in using the Known Issue Rollback or applying the group policy for Windows 10 version 20H2 and 21H1. The group policy based resolution is a better option than the KIR or Known Issue Rollback for this issue.

These issues find a resolution in KB5009543 and KB5010793. So, both updates are identical in most respects of the fixes provided fpr the issues reported on Windows 10 version 20H2, 21H1 and 21H2.

How can I get KB5009543 for Windows 10 version 20H2, 21H1, 21H2?

If you do not make use of the VPN connections, you can still continue to use the KB5009543 as your January update for Windows 10 version 20H2, 21H1, and 21H2. KB5009543 is available for download from the Microsoft update catalog on this page. You could also get the KB5009543 update using Windows Update, Windows Update for Business, or Windows Server Update Services (WSUS).

The preferred approach towards updating the January updates on Windows 10 version 20H2, 21H1, and 21H2 should be to patch the client workstations with the KB5010793 out-of-band update. This cumulative update would take care of the security and non-security improvements on the Windows 10 client computers.

Summary

  • KB5010793 update is an emergency cumulative update that works like the KB5009543 without breaking the VPN connections through Windows 10 client computers.
  • Your update strategy must focus on patching Windows 10 computers on your network with KB5010793. This achieves the desired functionality of a KB5009543 without breaking the VPN connections on Windows 10 based client computers of the network.

You may also like to read content related to January updates for Windows 10, Windows 11 and Windows servers in the following pages: