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Microsoft September 2021 Security Updates


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The Microsoft September 2021 security updates have been released and consist of 66 CVEs.  Of these CVEs, 3 are rated Critical, 62 are rated Important, and 1 Moderate in severity. 

One bug is listed as publicly known but is not being exploited at this time.

The updates apply to the following long list of products:  Azure Open Management Infrastructure, Azure Sphere, Dynamics Business Central Control, Microsoft Accessibility Insights for Android, Microsoft Edge (Chromium-based), Microsoft Edge for Android, Microsoft MPEG-2 Video Extension, Microsoft Office, Microsoft Office Access, Microsoft Office Excel, Microsoft Office SharePoint, Microsoft Office Visio, Microsoft Office Word, Microsoft Windows Codecs Library, Microsoft Windows DNS, Visual Studio, Windows Ancillary Function Driver for WinSock, Windows Authenticode, Windows Bind Filter Driver, Windows BitLocker, Windows Common Log File System Driver, Windows Event Tracing, Windows Installer, Windows Kernel, Windows Key Storage Provider, Windows MSHTML Platform, Windows Print Spooler Components, Windows Redirected Drive Buffering, Windows Scripting, Windows SMB, Windows Storage, Windows Subsystem for Linux, Windows TDX.sys, Windows Update, Windows Win32K, Windows WLAN Auto Config Service, and Windows WLAN Service.

See the KBs listed at September 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 September 2021 Security Update Review.

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