Microsoft Oktober 2021 Patchday (2021/10/12)

Update[German]On October 12, 2021, Microsoft released security updates for Windows clients and servers, for Office, etc. – as well as for other products – released. A list of updates can be found on this Microsoft page. Details about the update packages for Windows, Office, etc. are available in separate blog posts.


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Notes on the updates

Windows 10 version 2004, 20H2 and 21H1 share a common core and have an identical set of system files. Therefore, the same security update will be delivered for these Windows 10 versions. Information on how to enable the features of Windows 10 version 1909 as well as 20H2, which is done through an Enablement Package update, can be found in this tech community post.

All Windows 10 updates are cumulative. The monthly Patchday update includes all security fixes for Windows 10 and all non-security fixes through Patchday. In addition to vulnerability security patches, the updates include security enhancement measures. Microsoft is integrating the Servicing Stack Updates (SSUs) into the Latest Cumulative Updates (LCUs) for newer versions of Windows 10. A list of the latest SSUs can be found at ADV990001 (although the list is not always up-to-date).

Windows 7 SP1 is no longer supported as of January 2020. Only customers with a 2nd year ESU license (or bypasses) will still receive updates. With the current ESU bypass lets install the update. Updates can also be downloaded from the Microsoft Update Catalog . Updates for Windows RT 8.1 and Microsoft Office RT are only available through Windows Update.

Fixed vulnerabilities

The October 2021 security updates close vulnerabilities (71 CVEs, 4 are 0-day vulnerabilities, 3 are rated critical) in Microsoft products. A list of all covered CVEs can be found on this Microsoft page.

  • .NET Core & Visual Studio
  • Active Directory Federation Services
  • Console Window Host
  • HTTP.sys
  • Microsoft DWM Core Library
  • Microsoft Dynamics
  • Microsoft Dynamics 365 Sales
  • Microsoft Edge (Chromium-based)
  • Microsoft Exchange Server
  • Microsoft Graphics Component
  • Microsoft Intune
  • Microsoft Office Excel
  • Microsoft Office SharePoint
  • Microsoft Office Visio
  • Microsoft Office Word
  • Microsoft Windows Codecs Library
  • Rich Text Edit Control
  • Role: DNS Server
  • Role: Windows Active Directory Server
  • Role: Windows AD FS Server
  • Role: Windows Hyper-V
  • System Center
  • Visual Studio
  • Windows AppContainer
  • Windows AppX Deployment Service
  • Windows Bind Filter Driver
  • Windows Cloud Files Mini Filter Driver
  • Windows Common Log File System Driver
  • Windows Desktop Bridge
  • Windows DirectX
  • Windows Event Tracing
  • Windows exFAT File System
  • Windows Fastfat Driver
  • Windows Installer
  • Windows Kernel
  • Windows MSHTML Platform
  • Windows Nearby Sharing
  • Windows Network Address Translation (NAT)
  • Windows Print Spooler Components
  • Windows Remote Procedure Call Runtime
  • Windows Storage Spaces Controller
  • Windows TCP/IP
  • Windows Text Shaping
  • Windows Win32K

Similar articles
Microsoft Office Patchday (October 5, 2021)
Microsoft Oktober 2021 Patchday (2021/10/12)
Patchday: Windows 10-Updates (October 12, 2021)
Patchday: Windows 8.1/Server 2012 Updates (October 12, 2021)
Patchday: Updates for Windows 7/Server 2008 R2 (October 12, 2021)


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