Patchday: Windows 8.1/Server 2012 Updates ( April 13, 2021)

Windows Update[German]On April 13, Microsoft released various updates for Windows 8.1. However, these updates are also available for Windows Server 2012 R2. Here is some information about them.


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Updates for Windows 8.1 and Windows Server 2012 R2

A rollup and a 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.

KB5001382 (Monthly Rollup) für Windows 8.1/Server 2012 R2

Update KB5001382 (Monthly Rollup for Windows 8.1 and Windows Server 2012 R2) includes enhancements and fixes, and addresses the following issues.

  • Addresses a time zone change for Volgograd, Russia from UTC+4 to UTC+3 Moscow Standard Time (MSK).

  • Addresses a time zone change for The Republic of South Sudan from UTC+3 to UTC+2 Juba. For more information about this change, see KB 4601275.

  • Addresses an issue with security vulnerabilities identified by a security researcher. Because of these security vulnerabilities, this and all future Windows updates will no longer contain the RemoteFX vGPU feature. For more information about the vulnerability and its removal, see CVE-2020-1036 and KB4570006. Secure vGPU alternatives are available using Discrete Device Assignment (DDA) in Windows Server LTSC releases (Windows Server 2016 and Windows Server 2019) and Windows Server SAC releases (Windows Server, version 1803 and later versions).


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  • Addresses an issue that prevents you from specifying up to 255 columns when you use the Jet Text installable indexed sequential access method (IISAM) format.

  • Security updates to Windows Input and Composition, Windows Fundamentals, Windows Hybrid Cloud Networking, Windows Kernel, and Windows Media.

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 KB500140) 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.

KB5001393 (Security-only update) for Windows 8.1/Server 2012 R2

Update KB5001393 (Security Only Quality Update for Windows 8.1 and Windows Server 2012 R2) addresses the following items.

  • Addresses a time zone change for Volgograd, Russia from UTC+4 to UTC+3 Moscow Standard Time (MSK).

  • Addresses a time zone change for The Republic of South Sudan from UTC+3 to UTC+2 Juba. For more information about this change, see KB 4601275.

  • Security updates to Windows Input and Composition, Windows Fundamentals, Windows Hybrid Cloud Networking, Windows Kernel, and Windows Media.

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 KB5000800 (from March 2021) for Internet Explorer 11 should be installed. This is because a vulnerability is probably being actively exploited there.

Similar articles:
Microsoft Office Patchday (April 6, 2021)
Microsoft Security Update Summary (April 13, 2021)
Patchday: Windows 10-Updates (April 13, 2021)
Patchday: Windows 8.1/Server 2012 Updates ( April 13, 2021)


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