Microsoft Windows Security Updates September 2021 overview

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Today is Patch Day over at Microsoft and the company has released security updates and non-security updates for Windows and other company products.

Security updates have been released for all client and server versions of the Windows operating system that Microsoft supports. Other company products, such as Microsoft Office, have received updates as well.

Our Windows security updates overview for September 2021 provides system administrators, IT workers, and home users with information about the released updates.

You find the list of critical updates for each supported Windows operating system as well as the distribution of updates for each at the top. What follows are information about the released patches, links to support pages, information about known issues, and download details.

Click here to open the August 2021 Windows Patch Day overview here.

The Microsoft Windows Security Updates: September 2021

Click here to download an Excel spreadsheet that lists all released security updates: Microsoft-windows-security-updates-list-september-2021

Executive Summary

• Microsoft released security updates for all Windows client and server products.
  
• Security updates were released for other company products such as Azure Sphere, Microsoft Edge, Microsoft Office, Visual Studio, Dynamics Business Central Control or Microsoft Accessibility Insights for Android.
  
• The following client versions of Windows have known issues: Windows 7, Windows 8.1, Windows 10 version 1809, Windows 10 version 2004, 20H2, and 21H1
  
• The following server versions of Windows have known issues: Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server version 2004 and 20H2
  

Operating System Distribution

• Windows 7 (extended support only): 22 vulnerabilities: 2 critical and 20 important
  • Windows Scripting Engine Memory Corruption Vulnerability -- CVE-2021-26435
    
  • Windows WLAN AutoConfig Service Remote Code Execution Vulnerability -- CVE-2021-36965
    
• Windows 8.1: 24 vulnerabilities: 2 critical and 22 important
  • same as Windows 7
    
• Windows 10 version 1903 and 1909: 32 vulnerabilities: 2 critical and 30 important
  • same as Windows 7
    
• Windows 10 version 2004, 20H2 and 21H1 : 32 vulnerabilities, 2 critical and 30 important
  • same as Windows 7
    

Windows Server products

• Windows Server 2008 R2 (extended support only): 22 vulnerabilities: 2 critical and 20 important
  • Windows Scripting Engine Memory Corruption Vulnerability -- CVE-2021-26435
    
  • Windows WLAN AutoConfig Service Remote Code Execution Vulnerability -- CVE-2021-36965
    
• Windows Server 2012 R2: 24 vulnerabilities: 2 critical and 22 important
  • same as Windows Server 2008 R2.
    
• Windows Server 2016: 28 vulnerabilities: 2 critical and 26 important
  • same as Windows Server 2008 R2.
    
• Windows Server 2019: 32 vulnerabilities: 2 critical and 30 important
  • same as Windows Server 2008 R2.
    
• Windows Server 2022:  29 vulnerabilities: 7 critical and 18 important
  • same as Windows Server 2008 R2.
    

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