Patchday: Windows 8.1/Server 2012-Updates (12/08/2020)

Windows Update[German]On December 8, 2020, Microsoft released various updates for Windows 8.1. 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 und Windows Server 2012 R2

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

Important: Starting July 2020 all Windows updates disable the RemoteFX vGPU features due to the CVE-2020-1036 vulnerability (see also KB4570006). After installing this update, attempts to start virtual machines (VM) with RemoteFX vGPU enabled will fail.

KB4592484 (Monthly Rollup) for Windows 8.1/Server 2012 R2

Update KB4592484 (Monthly Rollup for Windows 8.1 and Windows Server 2012 R2) contains improvements and fixes, and addresses the following issues. 

  • Addresses an issue in which PDF24 Creator version 9.1.1 cannot open .txt files.
  • Addresses a security vulnerability by preventing applications that run as a SYSTEM account from printing to “FILE:” ports. To address this issue in the future, make sure your applications or services run as a specific user or service account.
  • Security updates to Windows Graphics, Windows Peripherals, and Windows Core Networking.

This update is automatically downloaded and installed by Microsoft Update Catalog, but is also available in the Microsoft Update Catalog and via WSUS. In case of a manual installation, the latest Servicing Stack Update(SSU KB4566425 dated July 14, 2020) must be installed beforehand – but this SSU cannot be uninstalled.

Microsoft is aware of the following problem in connection with the update: Certain operations, such as renaming, that you perform on 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. KB article KB4586845 suggests a workaround to correct this problem.

KB4592495 (Security-only update) for Windows 8.1/Server 2012 R2

Update KB4592495 (Security Only Quality Update for Windows 8.1 and Windows Server 2012 R2) addresses the following items.


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  • Addresses a security vulnerability by preventing applications that run as a SYSTEM account from printing to “FILE:” ports. To address this issue in the future, make sure your applications or services run as a specific user or service account.
  • Security updates to Windows Graphics, Windows Peripherals, and Windows Core Networking.

The update is available via WSUS or in the Microsoft Update Catalog. In case of a manual installation the latest Servicing Stack Update (SSU) KB4566425 must be installed first. The same errors are known as with the rollup update, details about the update are described in the KB article. I did not find a security update for Internet Explorer 11.

Similar articles:
Microsoft Office Patchday (December 1, 2020)
Microsoft Security Update Summary (Dezember 8, 2020)
Patchday: Windows 10-Updates (December 8, 2020)
Patchday: Updates for Windows 7/Server 2008 R2 (12/08/2020)
Patchday: Windows 8.1/Server 2012-Updates (12/08/2020)


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4 Responses to Patchday: Windows 8.1/Server 2012-Updates (12/08/2020)

  1. Yasir says:

    Hello Support, There few Windows 2012 R2 VM, i tried to install both of these updates are failing to install it install until 30% then automatically reboot the server then it goes through 75% then 91% and undoing changes. I tried everything thats on the internet.
    Please, assist because on some servers it was successful, it could be some prereq of this update is missing, but i need to know which was exactly, so i can install them. Please, help ASAP.

    • guenni says:

      Well, I’m not a supporter. Try a look into your %windir%\Logs\CBS\CBS.log, there should perhaps some hints, what’s the reason vor the rollback. Also the event log may give some clue.

  2. Yasir says:

    I did, i tried to do repair and even tried manual install the KB no luck. Its weired because this specific patch install fine all other VM except couple VMs.
    Please, assist furthur.

  3. Yasir says:

    Please, let me know how to fix can i send you the logs here?

    KB4592484 and KB4592495

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