Microsoft Windows Security Updates June 2021 overview

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

Windows Security Updates

Windows 7 SP1 and Windows Server 2008 R2

• Monthly Rollup: KB5003667
• Security-Only: KB5003694 

Updates and improvements:

• Security updates
• Fixes an issue in the SMB (Server Message Block) protocol which caused frequent crashes with stop error code 0xA on Windows Server 2008 R2 SP1 devices. (Security-only)

Windows 8.1 and Windows Server 2012 R2

• Monthly Rollup: KB5003671
• Security-only: KB5003681

Updates and improvements:

• Security updates

Windows 10 version 1909

• Support Page: KB5003637

Updates and improvements:

• Addresses an issue with an inconsistent shutdown during Windows Update that damages the Windows Management Instrumentation (WMI) repository.
• Addresses an issue that might prevent you from signing in to some Microsoft 365 desktop client apps after installing the May 11, 2021 or later update and restarting your device
• Security updates

Windows 10 version 2004, 20H2 and 21H1

• Support Page: KB5003173 

Updates and improvements:

• Security updates

Other security updates

KB5003165: Cumulative security update for Internet Explorer: May 11, 2021

Rest is being added once Microsoft updates its support pages.

Known Issues

Windows 7 SP1 and Server 2008 R2

• Connections to SQL Server 2005 may fail after installation of the update. Error "Cannot connect to <Server name>" may be displayed.
  • Microsoft notes that the behavior is expected and suggests that customers upgrade to a supported version of SQL server.
• Installed update may be reverted.
  • Expected behavior if the machine is not supported for ESU.
• Certain operations may fail on Cluster Shared Volumes.
  • Either perform the operation from a process with administrator privileges, or from a node that does not have CSV ownership.

Windows 8.1 and Server 2012 R2

• Certain operations may fail on Cluster Shared Volumes.
  • Either perform the operation from a process with administrator privileges, or from a node that does not have CSV ownership.

Windows 10 version 1909

• System and user certificates may be lost when the device is updated to a newer version of Windows 10.
  • Microsoft suggests to go back to the previous version of Windows, but it is only available up to 30 days after installation of the update.

Windows 10 version 2004, 20H2 and 21H1

• Same system and user certificates issue as version 1909.
• Issue with the Microsoft Japanese Input Method Editor and Japanese Kanji / Furigana characters.
  • No workaround at the time of writing. Microsoft is working on a resolution.
• Issues with the performance of games after installing recent updates.
  • Is resolved according to Microsoft except for Enterprise-managed devices.
• Issue with Microsoft Edge Legacy being removed but Microsoft Edge (new) not being installed if W10 is installed using custom offline media or ISO images.
  • Workaround provided on the support page.

Security advisories and updates

ADV 990001 -- Latest Servicing Stack Updates

Non-security related updates

Microsoft Office Updates

You find Office update information here.

How to download and install the June 2021 security updates

Security updates are downloaded and installed automatically on most Home systems running Windows. The updates are also released via WSUS and other update management systems, and provided as direct downloads on Microsoft's Update Catalog website.

You can check for updates in the following way on Windows when using Windows Updates:

1. Select Start, type Windows Update and load the Windows Update item that is displayed.
2. Select check for updates to run a manual check for updates.

Direct update downloads

Below are resource pages with direct download links, if you prefer to download the updates to install them manually.

Windows 7 and Server 2008 R2

• KB5003667  -- 2021-06 Security Monthly Quality Rollup for Windows 7
• KB5003694 -- 2021-06 Security Only Quality Update for Windows 7

Windows 8.1 and Windows Server 2012 R2

• KB5003671 -- 2021-06 Security Monthly Quality Rollup for Windows 8.1
• KB5003681 -- 2021-06 Security Only Quality Update for Windows 8.1

Windows 10 (version 1909)

• KB5003635 -- 2021-06 Cumulative Update for Windows 10 Version 1909

Windows 10 (version 2004)

• KB5003637 -- 2021-06 Cumulative Update for Windows 10 Version 2004

Windows 10 (version 20H2)

• KB5003637 -- 2021-06 Cumulative Update for Windows 10 Version  20H2

Windows 10 (version 21H1)

• KB5003637 -- 2021-06 Cumulative Update for Windows 10 Version  21H1

Additional resources

• June 2021 Security Updates release notes
• List of software updates for Microsoft products
• List of the latest Windows Updates and Services Packs
• Security Updates Guide
• Microsoft Update Catalog site
• Our in-depth Windows update guide
• How to install optional updates on Windows 10
• Windows 10 Update History
• Windows 8.1 Update History
• Windows 7 Update History

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