Patchday: Windows 8.1/Server 2012-Updates (May 11, 2021)

Windows[German]As of May 11, Microsoft has released various updates for Windows 8.1. These security updates are also available for Windows Server 2012 R2. Here is some information on the Monthly Rollup and Security only updates for these operating systems.


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Updates for Windows 8.1 und Windows Server 2012 R2

A rollup and security-only update have been released for Windows 8.1 and Windows Server 2012 R2. The update history for Windows 8.1 and Windows Server 2012 R2 can be found on this Microsoft page.

As of July 2020, all Windows updates disable the RemoteFX vGPU feature due to vulnerability CVE-2020-1036 (see also KB4570006). After installing this update, attempts to start virtual machines (VM) with RemoteFX vGPU enabled will fail.  Ab Juli 2020 deaktivieren alle Windows Updates die RemoteFX vGPU-Funktion aufgrund der Sicherheitslücke  (siehe auch ). Nach der Installation dieses Updates schlagen Versuche, virtuelle Maschinen (VM) zu starten, bei denen RemoteFX vGPU aktiviert ist, fehl.

In addition, Adobe’s Flash Player support expired on December 31, 2020, and as of January 12, 2021, Flash is no longer supported.

KB5003209 (Monthly Rollup) for Windows 8.1/Server 2012 R2

Update KB5003209 (Monthly Rollup for Windows 8.1 and Windows Server 2012 R2) includes enhancements and fixes, and addresses the following issues.

Security updates to Windows App Platform and Frameworks, Windows Silicon Platform, and Microsoft Scripting Engine.

This update is automatically downloaded and installed by Windows Update, but is also available from the Microsoft Update Catalog and via WSUS. If installing manually, the latest Servicing Stack Update (SSU KB5001403) must be installed beforehand – although this SSU cannot be uninstalled.

Microsoft is aware of the following issue related to the update: Certain operations, such as renaming, that you perform for files or folders on a Cluster Shared Volume (CSV) may fail with the error “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs when you perform the operation on a CSV owner node from a process that does not have administrator privileges. The KB article suggests a workaround to fix this.

KB5003220 (Security-only update) füor Windows 8.1/Server 2012 R2

Update KB5003220 (Security Only Quality Update for Windows 8.1 and Windows Server 2012 R2) addresses the following items.


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Security updates to Windows App Platform and Frameworks, and Windows Silicon Platform.

The update is distributed via WSUS (but not via Windows Update) or is available from the Microsoft Update Catalog.  In case of a manual installation, the latest Servicing Stack Update (SSU) KB5001403 must be installed beforehand. Furthermore, the cumulative security update KB5003165 (dated May 11, 2021) for Internet Explorer 11 should be installed.

Similar articles:
Microsoft Office Patchday (May 4, 2021)
Microsoft Security Update Summary (May 11, 2021)
Patchday: Windows 10-Updates (May 11, 2021)
Patchday: Windows 8.1/Server 2012-Updates (May 11, 2021)
Patchday: Windows 7/Server 2008 R2-Updates (May 11, 2021)


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