Microsoft Windows Security Updates June 2021 overview

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Microsoft released security updates and non-security updates for all supported client and server versions of Microsoft's Windows operating system as well as other company products. The June 2021 Patch Day is the first that includes Windows 10 version 21H1, the latest Windows 10 feature update that Microsoft released last month.

Our overview links to the security updates that Microsoft released, to support articles and downloads, lists known issues as revealed by Microsoft, and provides system administrators and home users with other relevant information.

Check out the May 2021 Patch overview here in case you want to revisit it.

The Microsoft Windows Security Updates: June 2021

You may download the following Excel spreadsheet to get a list of the security updates released for Microsoft Windows and other company products: Security Updates 2021-06-08-070201pm

Executive Summary

• Windows 10 version 21H1 was released last month. It is rolled out gradually to systems running Windows 10 version 2004 and 20H2 currently.
  
• All client and server versions of Windows are affected by at least 1 critical security vulnerability.
  
• Microsoft released updates for other products including Microsoft Office, Microsoft Intune, 3D Viewer, .Net Core & Visual Studio, Windows Defender, Paint 3D and Windows Installer.
  

Operating System Distribution

• Windows 7 (extended support only): 14 vulnerabilities: 2 critical and 12 important
  • Windows MSHTML Platform Remote Code Execution Vulnerability - CVE-2021-33742
    
  • Scripting Engine Memory Corruption Vulnerability -- CVE-2021-31959
    
• Windows 8.1: 19 vulnerabilities: 2 critical and 12 important
  • same critical as Windows 7
    
• Windows 10 version 1903 and 1909: 24 vulnerabilities: 2 critical and 22 important
  • same critical as Windows 7
    
• Windows 10 version 2004, 20H2 and 21H1 : 25 vulnerabilities, 2 critical and 23 important
  • same critical as Windows 7
    

Windows Server products

• Windows Server 2008 R2 (extended support only): 12 vulnerabilities: 1 critical and 11 important
  • Windows MSHTML Platform Remote Code Execution Vulnerability -- CVE-2021-33742
    
• Windows Server 2012 R2: 19 vulnerabilities: 2 critical and 17 important
  • Scripting Engine Memory Corruption Vulnerability -- CVE-2021-31959
    
  • Windows MSHTML Platform Remote Code Execution Vulnerability -- CVE-2021-33742
    
• Windows Server 2016: 20 vulnerabilities: 2 critical and 18 important.
  • same as Windows Server 2012 R2
    
• Windows Server 2019: 24 vulnerabilities: 2 critical and 22 important
  • same as Windows Server 2012 R2
    

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