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Microsoft October 2021 Security Updates


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The Microsoft October 2021 security updates have been released and consist of 71 CVEs. Of these CVEs, 2 are rated Critical, 68 are rated Important, and 1 Low in severity.


For new Windows 11 adapters, note that the update today includes the first "Update Tuesday" update.


The updates apply to the following long list of products: .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, and Windows Win32K.


See the KBs listed at October 2021 Security Updates - Release Notes - Security Update Guide - Microsoft for information regarding known issues with the security updates as well as the CVEs with FAQs, Mitigations and/or Workarounds.


Recommended Reading: See Dustin Childs review and analysis in Zero Day Initiative -- The October 2021 Security Update Review.

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