[German]On June 8, 2021 (second Tuesday of the month, Patchday at Microsoft), several cumulative updates were released for the supported Windows 10 builds (from RTM version to the current version 21H1). 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 web page. I have pulled out the details below. Since March 2021, Microsoft has integrated the Servicing Stack Updates (SSUs) into the cumulative update. But that only applies to Windows 10 version 2004 and later, so there are still separate SSU installations for older Windows 10 versions.
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 via Update Search in October 2020 and Windows 10 version 21H1 released in May 2021, Microsoft will provide the same update packages mentioned below.
Update KB5003637 for Windows 10 Version 2004/20H2/21H1
Cumulative Update KB5003637 raises the OS build for Windows 10 version 2004 to 19041.1052 and for Windows 10 version 20H2 to 19042.1052. For Windows 10 version 21H1, it becomes OS build 19043.1052. 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 Legay Edge browser was removed from Windows 10 in April 2021. Here is the list of improvements, called highlights by Microsoft:
- Updates to improve security when using input devices such as a mouse, keyboard, or pen.
- Updates to improve Windows OLE (compound documents) security.
- Updates for verifying usernames and passwords.
- Updates to improve security when Windows performs basic operations.
- Updates for storing and managing files.
Microsoft notes that this update makes quality improvements to the servicing stack (is responsible for Microsoft updates). In addition, the following general fixes and improvements are made:
Security updates to the Microsoft Scripting Engine, Windows App Platform and Frameworks, Windows Input and Composition, Windows Management, Windows Cloud Infrastructure, Windows Authentication, Windows Fundamentals, Windows Virtualization, Windows Kernel, Windows HTML Platform, and Windows Storage and Filesystems.
An installed update KB5003173 from May 11, 2021 is mandatory to install the latest LCU (thanks to Martin E. for the hint). This update is automatically downloaded and installed by Windows Update, but is also available from the Microsoft Update Catalog and via WSUS. Microsoft states various known issues for the update in the support article KB5003637.
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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.
Update KB5003635 for Windows 10 Version 1909
Cumulative Update KB5003635 raised the Windows 10 V1909 OS build to 18363.1621. The update is available for Windows 10 version 1909 as well as Windows Server version 1909. The legacy Edge browser was already removed in April. The update includes quality improvements but no new OS features. Here is the list of improvements, called highlights by Microsoft:
- Updates to improve security when Windows performs basic operations.
- Updates to improve Windows OLE (compound documents) security.
- Updates for verifying usernames and passwords.
- Updates for storing and managing files.
- Updates to improve security when using input devices such as a mouse, keyboard, or pen.
- Updates an issue that might prevent you from signing in to some Microsoft 365 desktop client apps after installing the May 11, 2021 or later update and restarting your device.In addition, the following fixes and improvements to Windows 10 version 1909:
In addition, the following fixes and improvements to Windows 10 version 1909:
- Addresses an issue with an inconsistent shutdown during Windows Update that damages the Windows Management Instrumentation (WMI) repository. As a result, the Managed Object Format (MOF) Advance Installer fails.
- Addresses an issue that might prevent you from signing in to some Microsoft 365 desktop client apps after installing the May 11, 2021 or later update and restarting your device. You might also receive an 80080300 error or "We ran into a problem. Reconnecting…" when attempting to authenticate or sign in to Teams.
- Security updates to the Microsoft Scripting Engine, Windows App Platform and Frameworks, Windows Input and Composition, Windows Management, Windows Cloud Infrastructure, Windows Authentication, Windows Fundamentals, Windows Virtualization, Windows Kernel, Windows HTML Platform, and Windows Storage and Filesystem.
This update is automatically downloaded and installed by Windows Update. This update is also available from the Microsoft Update Catalog and via WSUS. Microsoft strongly recommends that you install the latest Service Stack Update (SSU) for your operating system before installing the latest Cumulative Update (LCU). For the update, Microsoft cites various issues that are documented in the support article.
In addition, Microsoft has released an update directly to 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
The following updates are available for Windows 10 October 2018 Update (version 1809) and Windows Server 2019.
Update KB5003646 for Windows 10 Version 1809
Cumulative Update KB5003646 raises the OS build (according to MS) to 17763.1999 and includes quality improvements but no new OS features. Also for this Windows 10 version, which now only receives updates for Enterprise, Education, IoT Enterprise, is out on May 11, 2021 from but the supply of security updates. Here is the list of improvements, called highlights by Microsoft:
- Updates to improve security when Windows performs basic operations.
- Updates to improve Windows OLE (compound documents) security.
- Updates for verifying usernames and passwords.
- Updates for storing and managing files.
- Updates to improve security when using input devices such as a mouse, keyboard, or pen.
In addition, there are the following fixes and improvements to the Windows version:
- Addresses an issue with an inconsistent shutdown during Windows Update that damages the Windows Management Instrumentation (WMI) repository. As a result, the Managed Object Format (MOF) Advance Installer fails.
- Security updates to the Microsoft Scripting Engine, Windows App Platform and Frameworks, Windows Input and Composition, Windows Management, Windows Cloud Infrastructure, Windows Authentication, Windows Fundamentals, Windows Virtualization, Windows Kernel, Windows HTML Platform, and Windows Storage and Filesystem.
This update is automatically downloaded and installed by Windows Update, but is also available from the Microsoft Update Catalog. Microsoft strongly recommends that you install the latest Service Stack Update (SSU) for your operating system before installing the latest Cumulative Update (LCU). Microsoft lists the known issue that the update causes. Error 0x800f0982 – PSFX_E_MATCHING_COMPONENT_NOT_FOUND may occur during the update installation. 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 to 1607
Updates for the Enterprise LTSC versions are available for Windows 10 RTM through version 1607. These updates are automatically downloaded and installed by Windows Update, but are available for download from the Microsoft Update Catalog (search for the 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 KB5003638 is now only available for Enterprise LTSC. The update raises the OS build to 14393.4467.
- Windows 10 Version 1507: Update KB5003687 is available for the RTM version (LTSC). The update raises the OS build to 10240.18967.
There was no update for the remaining Windows 10 versions, as these versions have fallen out of support. Details about the above updates can be found in the respective Microsoft KB articles if in doubt.
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