Patchday: Windows 10 Updates (April 12, 2022)

Windows[German]On April 12, 2022 (Microsoft's second Tuesday of the month patch day), several cumulative updates were released for supported Windows 10 builds (from the RTM version to the current version). Here are some details about each of the April 2022 patch day security updates.


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A list of the updates can be found on this Microsoft website. I have pulled out the details below. Since March 2021, Microsoft has integrated the Servicing Stack Updates (SSUs) for newer Windows 10 builds into the cumulative update.

Updates for Windows 10 Version 20H2-21H2

For the Windows 10 versions mentioned above, Microsoft provides only one update package, which is mentioned below.

Update KB5012599 for Windows 10 Version 20H2 – 21H2

Cumulative Update KB5012599 raises the OS build for Windows 10 version 20H2 to 19042.1645, for Windows 10 version 21H1 to 19043.16456 and for Windows 10 version 21H2 to 19044.1645. The update only contains security fixes, but no new operating system features.

Addresses an issue that causes a Denial of Service vulnerability on Cluster Shared Volumes (CSV). For more information, see CVE-2020-26784.

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. If the update from May 11, 2021 (KB5003173) or a newer LCU is missing, the special, standalone SSU from August 10, 2021 (KB5005260) must be installed beforehand. For the update, Microsoft states various known issues in the support article. Thus, an RDP connection problem is rolled back via KIR.

Updates for Windows 10 Version 1909

The following updates are available for Windows 10 version 1909 released in 2019.


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Update KB5012591 for Windows 10 Version 1909

Cumulative Update KB5012591 raises the Windows 10 V1909 OS build to 18363.2212. The update is available for Windows 10 Enterprise/Education version 1909. The update includes quality improvements but no new OS features and is intended to improve security. Unspecified security fixes are mentioned for this update.

This update contains miscellaneous security improvements to internal OS functionality. No additional issues were documented for this release.

This update is automatically downloaded and installed by Windows Update. This update is also available in the Microsoft Update Catalog and via WSUS and WUfB. Microsoft has now included the latest Service Stack Update (SSU) as build 18363.2150 in the cumulative update. The SSU (KB5004748) from July 13, 2021 must be installed before the cumulative update is installed. Microsoft does not indicate any known issues for the update. Details can be found in the KB article.

Updates for Windows 10 Version 1809

Windows 10 October 2018 Update (version 1809) has fallen out of support, but the following update is available for Windows 10 Enterprise 2019 LTSC and Windows Server 2019.

Update KB5012647 for Windows 10 Enterprise 2019 LTSC /Windows Server 2019 LTSC

Cumulative Update KB5012647 raises the OS build (according to MS) to 17763.2803 and includes quality improvements but no new OS features. Also for this Windows 10 version, which only receives updates for Enterprise LTSC and IoT Enterprise LTSC (the rest of the variants are out of the security update supply on May 11, 2021) brings the following fixes as highlights:

  • Updates an issue that prevents you from changing a password that has expired when you sign in to a Windows device.
  • Updates security for your Windows operating system.

The fix for password entry might fix the problem I mentioned in the blog post Windows Server: Open issues from March 2022 Updates (KB5011551, KB5011497). Microsoft states the following fixes that the update makes.

  • Addresses an issue that causes DNS stub load failures on a Windows Server that is running a DNS Server.
  • Addresses an issue that causes a Denial of Service vulnerability on Cluster Shared Volumes (CSV). For more information, see CVE-2020-26784.
  • Addresses an issue that prevents you from changing a password that has expired when you sign in to a Windows device.

This update is automatically downloaded and installed by Windows Update, but is also available from the Microsoft Update Catalog, ia WSUS and WUfB. Microsoft has also updated the Service Stack Update (SSU) to build 17763.2744. Microsoft lists several known issues. Details can be found in the KB article.

Updates for Windows 10 Version 1507 till 1607

Updates for the Enterprise LTSC versions are available for Windows 10 RTM up to version 1607. These updates are automatically downloaded and installed by Windows Update, but are available for download from the Microsoft Update Catalog (search by KB number). Before manual installation, the latest Servicing Stack Update (SSU) must be installed. Details can be found in the respective KB article.

  • Windows 10 Version 1607: Update KB5012596 is now only available for Enterprise LTSC and Windows Server 2016. The update upgrades the OS build to 14393.5066.
  • Windows 10 Version 1507: Update KB5012653 s available for the RTM version (LTSC). The update raises the OS build to 10240.19265.

There was no update for the remaining Windows 10 versions, as these versions are no longer supported. Details about the above updates can be found in the respective Microsoft KB articles.

Similar articles:
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Microsoft Security Update Summary (April 12, 2022)
Patchday: Windows 10 Updates (April 12, 2022)
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Windows 7/Server 2008R2; Windows 8.1/Server 2012R2: Updates (April 12, 2022)
Patchday: Microsoft Office Updates (April 12, 2022)


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