Patchday: Windows 11/Server 2022-Updates (December 13, 2022)

Windows[German]On December 13 (second Tuesday of the month, Microsoft patch day), Microsoft also released cumulative updates for Windows 11 22H1 and 22H2. In addition, Windows Server 2022 received an update. Here are some details about these updates, which are supposed to fix vulnerabilities as well as issues.


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Updates for Windows 11 21H1 – 22H2

A list of Windows 11 updates can be found on this Microsoft website. I have pulled out the details below. Microsoft now provides the following updates for the Windows 11 versions mentioned above.

Update KB5021255 for Windows 11 22H2

Cumulative Update KB5021255 raises the OS build on Windows 11 at 22621.963 and includes quality improvements as well as security patches, but no new operating system features. The following highlights are addressed:

  • This update addresses a known issue that might affect Task Manager. It might display certain elements in the user interface (UI) in unexpected colors. Some parts of the UI might not be readable. This issue might occur if you have "Choose your mode" set to "Custom" in the Personalization > Colors section of Settings.
  • This update addresses security issues for your Windows operating system.

Furthermore, Microsoft states that the following improvements have also been made.

This update addresses an issue that might affect Data Protection Application Programming Interface (DPAPI) decryption. The decryption of a certificate private key might fail. Because of this, virtual private network (VPN) and other 802.1 certificate-based authentication might fail. This issue might occur when you encrypt the DPAPI master key with a wrong value.

Microsoft is keeping quiet about the details of the fixes. If you want to know what else has been fixed, you will have to read the details in the preview update from the previous month (see Windows 11 22H2: Preview Update KB5020044 (Nov. 29, 2022)). Microsoft notes that this update makes quality improvements to the servicing stack (is responsible for Microsoft updates). This update is automatically downloaded and installed by Windows Update, but is also available from the Microsoft Update Catalog and via WSUS and WUfB. The update causes various problems, which are listed in the support article.

Update KB5021234 for Windows 11 21H2

Cumulative Update KB5021234 aises the OS build for Windows 11 to 22000.1335 and includes quality improvements as well as security patches, but no new operating system features. Highlights include:

This update addresses security issues for your Windows operating system.

Regarding the improvements made, Microsoft mentions the following:


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  • This update addresses an issue that affects remote networks. This issue stops you from reconnecting to them using DirectAccess.
  • This update addresses an issue that might affect Data Protection Application Programming Interface (DPAPI) decryption. The decryption of a certificate private key might fail. Because of this, virtual private network (VPN) and other 802.1 certificate-based authentication might fail. This issue might occur when you encrypt the DPAPI master key with a wrong value.

The Direct Access problem (Microsoft confirms Direct Access issues after Nov. 2022 updates) should be fixed. Microsoft is keeping quiet about the details of the other fixes. If you want to know what else has been fixed, you'll have to read the details in the previous month's preview update (see Windows 11 21H2: Preview-Update KB5019157 (Nov. 15, 2022)). Microsoft notes that this update makes quality improvements to the servicing stack (is responsible for Microsoft updates). This update is automatically downloaded and installed by Windows Update, but is also available from the Microsoft Update Catalog and via WSUS and WUfB. However, note the known issues indicated in the support article.

Windows Server 2022

According to this Microsoft page, cumulative update KB5021249 has been released for Windows Server 2022, raising the OS build to 20348.1266. Regarding the fixes this update makes, Microsoft writes:

This update addresses an issue that affects remote networks. This issue stops you from reconnecting to them using DirectAccess.

So also here the Direct Access fix. But no further details are mentioned about the other fixes – these were described in the preview update KB5020032 from the previous month. Microsoft notes that this update makes quality improvements to the servicing stack (which is responsible for Microsoft updates). This update is automatically downloaded and installed by Windows Update, but is also available from the Microsoft Update Catalog and via WSUS and WUfB. Microsoft lists some known issues (including ODBC connection problems) related to the update.

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