Patchday: Windows 10-Updates (September 14, 2021)

Windows[German]On September 14, 2021 (second Tuesday of the month, Patchday at Microsoft), several cumulative updates were released for the supported Windows 10 builds (from the RTM version to the current version 21H1). Among other things, there are patches against the MSHTML vulnerability and another PrintNightmare fix. Here are some details about the respective patchday security updates.


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A list of the updates can be found on this Microsoft website (but the German language pages are not up to date yet). I have pulled out the details below. Since March 2021, Microsoft integrates the Servicing Stack Updates (SSUs) into the cumulative update for newer Windows 10 builds.

Updates for Windows 10 Version 2004/20H2/21H1

For Windows 10 version 2004 released in May 2020, as well as Windows 10 version 20H2 offered in October 2020 and Windows 10 version 21H1 released in May 2021, Microsoft is providing the same update packages mentioned below.

Update 5005565 for Windows 10 Version 2004/20H2/21H1

Cumulative Update KB5005565 raises the OS build to 19041.1237 for Windows 10 version 2004 and to 19042.1237 for Windows 10 version 20H2. For Windows 10 version 21H1, it becomes OS build 19043.1237. The update is available for Windows 10 version 2004, Windows 10 version 20H2, Windows 10 version 21H1, and for Windows Server version 2004, Windows Server version 20H2, and Windows Server version 21H1. It includes quality improvements but no new operating system features. The point-and-print vulnerability has been addressed. Here is the list of improvements:

Addresses an issue that causes PowerShell to create an infinite number of child directories. This issue occurs when you use the PowerShell Move-Item command to move a directory to one of its children. As a result, the volume fills up and the system stops responding.

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.

In addition, Microsoft has released an update directly for the Windows Update client to improve its reliability. This is rolled out outside of Windows Update if the machine is compatible and not an LTSC variant and updates have not been blocked via GPO..

Updates for Windows 10 Version 1909

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


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Update KB5005566 for Windows 10 Version 1909

Cumulative Update KB5005566 raises the Windows 10 V1909 OS build to 18363.1801. The update is available for Windows 10 Enterprise/Education version 1909 and Windows Server version 1909. The update includes quality improvements but no new OS features. Here is the list of improvements:

Addresses an issue that causes PowerShell to create an infinite number of child directories. This issue occurs when you use the PowerShell Move-Item command to move a directory to one of its children. As a result, the volume fills up and the system stops responding.

This update is automatically downloaded and installed by Windows Update. This update is also available from the Microsoft Update Catalog and via WSUS and WUfB. Microsoft has now included the latest Service Stack Update (SSU) in the cumulative update. Microsoft does not state any problem for this update in the support article.

In addition, Microsoft has released an update directly for the Windows Update client to improve its reliability. This is rolled out outside of Windows Update if the machine is compatible and not an LTSC variant and updates have not been blocked via GPO.

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 KB5005568 for Windows 10 Version 1809

Cumulative Update KB5005568 raises the OS build (according to MS) to 17763.2183 and includes quality improvements but no new OS features. Also for this Windows 10 version, which only receives updates for Enterprise, Education, IoT Enterprise LTSC (the rest of the variants are out of the security update supply on May 11, 2021), Microsoft provided the following improvements:

Updates security for your Windows operating system.

In addition, there are the following fixes and improvements to the Windows version:

  • Addresses an issue that causes PowerShell to create an infinite number of child directories. This issue occurs when you use the PowerShell Move-Item command to move a directory to one of its children. As a result, the volume fills up and the system stops responding.

This update is automatically downloaded and installed by Windows Update, but is also available from the Microsoft Update Catalog, via WSUS and WUfB. Microsoft has also updated the Service Stack Update (SSU). Microsoft lists the known issue that the update causes. During the update installation the error 0x800f0982 – PSFX_E_MATCHING_COMPONENT_NOT_FOUND can occur. Details can be found in the KB article.

In addition, Microsoft has released an update directly for the Windows Update client to improve its reliability. This is rolled out outside of Windows Update if the machine is compatible and not an LTSC variant and updates have not been blocked via GPO.

Updates for Windows 10 Version 1507 bis 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 KB5005573 is now only available for Enterprise LTSC. The update raises the OS build to 14393.4561.
  • Windows 10 Version 1507: Update KB5005569 is available for the RTM version (LTSC). The update upgrades the OS build to 10240.19060

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.

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