- September 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
Microsoft Windows Security Updates September 2021 overview
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.
Windows Security Updates
Windows 7 SP1 and Windows Server 2008 R2
Updates and improvements:
- Addresses an issue in which a driver might not install if the driver is signed with more than one code sign signatures.
- This update also contains miscellaneous security improvements to internal OS functionality.
Windows 8.1 and Windows Server 2012 R2
Updates and improvements:
- This update contains miscellaneous security improvements to internal OS functionality. No additional issues were documented for this release.
Windows 10 version 1909
- Support Page: KB5005566
Updates and improvements:
- Addresses an issue that causes PowerShell to create an infinite number of child directories. This issue occurs when you use the PowerShell Move-Item command to move a directory to one of its children. As a result, the volume fills up and the system stops responding.
- Security updates
Windows 10 version 2004, 20H2 and 21H1
- Support Page: KB5005565
Updates and improvements:
- Addresses an issue that causes PowerShell to create an infinite number of child directories. This issue occurs when you use the PowerShell Move-Item command to move a directory to one of its children. As a result, the volume fills up and the system stops responding.
- Security updates
Other security updates
2021-09 Cumulative Security Update for Internet Explorer (KB5005563)
Windows Server
2021-09 Security Monthly Quality Rollup for Windows Server 2008 (KB5005606)
2021-09 Security Only Quality Update for Windows Server 2008 (KB5005618)
2021-09 Security Only Quality Update for Windows Embedded 8 Standard and Windows Server 2012 (KB5005607)
2021-09 Security Monthly Quality Rollup for Windows Embedded 8 Standard and Windows Server 2012 (KB5005623)
2021-09 Cumulative Update for Microsoft server operating system version 21H2 for x64-based Systems (KB5005575)
2021-09 Cumulative Update for Windows Server 2016 and Windows 10 Version 1607 (KB5005573)
Servicing Stack Updates
2021-09 Servicing Stack Update for Windows Server 2016 and Windows 10 Version 1607 (KB5005698)
Known Issues
Windows 7 SP1 and Windows Server 2008 R2
- Certain operations may fail on Cluster Shared Volumes with the error "STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)"
- Workaround: run the operations from an elevated process, or from a node that does not have CSV ownership
- Updates may be reverted if the system does not support ESU.
- Expected behavior.
Windows 8.1 and Windows Server 2012 R2
- Certain operations may fail on Cluster Shared Volumes with the error "STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)"
- Workaround: run the operations from an elevated process, or from a node that does not have CSV ownership
Windows 10 version 1809
- Some devices with unspecified Asian language packs installed may throw the error "0x800f0982 - PSFX_E_MATCHING_COMPONENT_NOT_FOUND".
- Try uninstalling and reinstalling the recently added language packs, then running a manual check for updates.
- If that does not work, Microsoft suggests to use the Reset this PC function and selecting to keep the files.
Windows 10 version 2004, 20H2 and 21H1
- Some devices may be unable to install updates, throwing the error "PSFX_E_MATCHING_BINARY_MISSING".
- Check out our guide on fixing the error.
- Custom offline media or custom ISO image installations on devices may remove Microsoft Edge Legacy but may not replace it with the Chromium-based Microsoft Edge.
- Workaround described on the support page.
Security advisories and updates
ADV 990001 -- Latest Servicing Stack Updates
Non-security updates
- 2021-09 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows Server, version 20H2, Windows 10 Version 20H2, Windows Server, version 2004, Windows 10 Version 2004, Windows Server, version 1909, Windows 10 Version 1909, Windows Server 2019 (1903), and Windows 10 Version 1903 (KB5005548)
Microsoft Office Updates
You find Office update information here.
How to download and install the September 2021 security updates
Security updates are downloaded and installed automatically via Windows Update on most Home and some business/Enterprise systems.
Windows checks for updates frequently and will download those classified as security updates automatically to install them.
Windows administrators may check for the updates manually to download and install the patches right away.
- Select Start, type Windows Update and load the Windows Update item that is displayed.
- 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
- KB5005633 -- 2021-09 Security Monthly Quality Rollup for Windows 7
- KB5005615 -- 2021-09 Security Only Quality Update for Windows 7
Windows 8.1 and Windows Server 2012 R2
- KB5005613 -- 2021-09 Security Monthly Quality Rollup for Windows 8.1
- KB5005627 -- 2021-09 Security Only Quality Update for Windows 8.1
Windows 10 (version 1909)
- KB5005566 -- 2021-09 Cumulative Update for Windows 10 Version 1909
Windows 10 (version 2004)
- KB5005565 -- 2021-09 Cumulative Update for Windows 10 Version 2004
Windows 10 (version 20H2)
- KB5005565 -- 2021-09 Cumulative Update for Windows 10 Version 20H2
Windows 10 (version 21H1)
- KB5005565 -- 2021-09 Cumulative Update for Windows 10 Version 21H1
Additional resources
Summary
Article Name
Microsoft Windows Security Updates September 2021 overview
Description
Microsoft has released security updates and non-security updates for its Windows operating system on the Windows September 2021 Patch Day.
Author
Martin Brinkmann
Publisher
Ghacks Technology News
Logo
What mental age of reader are you targeting with the first sentence? 10?
Why not write an article on how to *avoid* upgrading from W10 to W11. Analogous to those like me who avoided upgrading from 7 to 10 for as long as possible.
If your paymaster Microsoft permits it, of course.
5. Rufus
6. Ventoy
PS. I hate reading these “SEO optimized” articles.
I used Rufus to create an installer for a 6th gen intel i5 that had MBR. It upgraded using Setup. No issues except for Win 11 always prompting me to replace my local account. Still using Win 10 Pro on all my other PCs to avoid the bullying.
bit pointless to upgrade for the sake of upgrading as you never know when you’ll get locked out because ms might suddenly not provide updates to unsupported systems.
ps…. time travelling?
written. Jan 15, 2023
Updated • Jan 13, 2023
This happens when you schedule a post in WordPress and update it before setting the publication date.
Anyone willing to downgrade to this awful OS must like inflicting themselves with harm.
I have become convinced now that anybody who has no qualms with using Windows 11/10 must fit into one of the following brackets:
1) Too young to remember a time before W10 and W11 (doesn’t know better)
2) Wants to play the latest games on their PC above anything else (or deeply needs some software which already dropped W7 support)
3) Doesn’t know too much about how computers work, worried that they’d be absolutely lost and in trouble without the “”latest security””
4) Microsoft apologist that tries to justify that the latest “features” and “changes” are actually a good thing, that improve Windows
5) Uses their computer to do a bare minimum of like 3 different things, browse web, check emails, etc, so really doesn’t fuss
Obviously that doesn’t cover everyone, there’s also the category that:
6) Actually liked W7 more than 10, and held out as long as possible before switching, begrudgingly uses 10 now
Have I missed any group off this list?
You have missed in this group just about any professional user that uses business software like CAD programs or ERP Programs which are 99% of all professional users from this list.
Linux doesn’t help anyone who is not a linux kid and apple is just a fancy facebook machine.
Microsoft has removed KB5029351 update
only from windows update though
KB5029351 is still available from the ms update catalog site
1. This update is labaled as PREVIEW if it causes issues to unintelligent people, then they shouldn’t have allowed Preview updates ot install.
2. I have installed it in a 11 years old computer, and no problems at all.
3. Making a big drama over a bluescreen for an updated labeled as preview is ridiculous.
This is probably another BS internet drama where people ran programs and scripts that modified the registry until they broke Windows, just for removing stuff that they weren’t even using just for the sake of it.
Maybe people should stop playing geeks and actually either use Windows 10 or Windows 11, but don’t try to modify things just for the sake of it.
Sometimes removing or stopping things (like defender is a perfect example) only need intelligence, not scripts or 3rd party programs that might mess with windows.
Windows 11 was a pointless release, it was just created because some of the Windows team wanted to boost sales with some sort of new and improved Windows 10. Instead, Microsoft cannot support one version well let alone two.
Windows 11 is the worst ugly shame by Microsoft ever. They should release with every new W11 version a complete free version of Starallback inside just to make this sh** OS functionally again.
motherboard maker MSI has recently released a statement regarding the “unsupported processor” blue screen error for their boards using Intel 600/700 series chipsets & to avoid the KB5029351 Win11 update:
https://www.msi.com/news/detail/MSI-On–UNSUPPORTED-PROCESSOR–Error-Message-of-Windows-11-Update-KB5029351-Preview-142215
check out the following recent articles:
Neowin – Microsoft puts little blame on its Windows update after UNSUPPORTED PROCESSOR BSOD bug:
https://www.neowin.net/news/microsoft-puts-little-blame-on-its-windows-update-after-unsupported-processor-bsod-bug/
BleepingComputer – Microsoft blames ‘unsupported processor’ blue screens on OEM vendors:
https://www.bleepingcomputer.com/news/microsoft/microsoft-blames-unsupported-processor-blue-screens-on-oem-vendors/
While there may be changes or updates to the Windows 10 Store for Business and Education in the future, it is premature to conclude that it will be discontinued based solely on rumors.
My advice, I left win 15 years ago. Now I’m a happy linux user (linuxmint) but there is Centos, Fedora, Ubuntu depending on your needs.
motherboard maker MSI has recently released new BIOS/firmware updates for their Intel 600 & 700 series motherboards to fix the “UNSUPPORTED_PROCESSOR” problem (Sept. 6):
https://www.msi.com/news/detail/Updated-BIOS-fixes-Error-Message–UNSUPPORTED-PROCESSOR–caused-BSOD-on-MSI-s-Intel-700-and-600-Series-Motherboards-142277
I try to disable the Diagnostics Tracking Service (Connected Devices Platform User Services) but it wont let me disable it, any help will be greatly appreciated.
Tank you for your help