Bugs Reported in Microsoft Patch Tuesday Updates

Update: Tuesday, January 18, 2022

Microsoft released out of band updates on Monday, January 17 to address the issues with VPN connectivity, Windows Server Domain Controllers restarting, virtual machine start failures, and ReFS-formatted media failing to mount. The optional updates have been made available on the Microsoft Update Catalog for admins to patch affected devices.

New updates here:

  • Windows 11, version 21H1 (original release): KB5010795

  • Windows Server 2022: KB5010796

  • Windows 10, version 21H2: KB5010793

  • Windows 10, version 21H1: KB5010793

  • Windows 10, version 20H2, Windows Server, version 20H2: KB5010793

  • Windows 10, version 20H1, Windows Server, version 20H1: KB5010793

  • Windows 10, version 1909, Windows Server, version 1909: KB5010792

  • Windows 10, version 1607, Windows Server 2016: KB5010790

  • Windows 10, version 1507: KB5010789

  • Windows 7 SP1: KB5010798

  • Windows Server 2008 SP2: KB5010799

Updates for the following Windows versions are available only on Microsoft Update Catalog. For instructions, see the KB for your OS listed below:

Bugs in Windows Server Updates

This month’s Patch Tuesday release brought 97 vulnerabilities to light from Microsoft, including patches for Windows Server. These updates, however, contain bugs that have been reported by admins rolling it out.

More specifically, the Windows Server 2012 R2 KB5009624 update, Windows Server 2019 KB5009557 update, and Windows Server 2022 KB5009555 update have been reported to cause issues, including HyperV not running for Server 2012 and VPN issues on Server 2019 and 2022. HyperV not starting on servers can have a significant impact on your organization if critical business functions run on it. Admins are reporting that these issues are only resolved once the updates are rolled back on the system.

What should be done?

These patches do remediate security issues, but their potential impact on operability is significant enough to recommend that you do not update to these patches at this time. As of now, the updates are still available in the Microsoft catalog, so it’s important to scrutinize the list of updates you are pulling in. You can monitor the status of these issues here as Microsoft works to confirm and resolve them.

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