The Windows September 2023 security updates are now available
Microsoft published security updates for Windows and also other company products today on the September 2023 Patch Day. Security updates are available for all supported client and server versions of Windows and other products, including Microsoft Office. All client versions of Windows that are supported by Microsoft are affected by a single critically rated vulnerability.
The updates are released via Windows Update, update management systems and also as direct downloads from Microsoft's website.
Our monthly overview of the windows security updates is created as a resource for system administrators and home users alike. It lists important information about the Patch Day and the released patches, links to support pages, lists all known issues and other released updates, and includes download information and more resource links.
You can open the August 2023 Patch Day overview here.
Microsoft Windows Security Updates: September 2023
Here is a link to an Excel spreadsheet that lists information about the released security updates on the September 2023 Microsoft Patch Day. Activate the following link to download an archive file that contains the spreadsheet: microsoft windows security updates september 2023
Executive Summary
- Windows 11 version 21H2, the release version of Windows 11, will run out of support in October 2023. Microsoft will enforce updates.
- Microsoft patched a total of 59 Microsoft and 6 non-Microsoft CVEs on this patch day.
- The following Windows client version have known issues: None!
- The following Windows server versions have known issues: Windows Server 2008 and 2008 R2, Windows Server 2022.
- Other company products with updates include 3D Viewer, Microsoft Exchange Server, Microsoft Office. .NET and Visual Studio, and Microsoft Edge.
The critical vulnerabilities are linked below only.
- Windows 10 version 22H2: 16 vulnerabilities, 1 critical and 15 important.
- Internet Connection Sharing (ICS) Remote Code Execution Vulnerability -- CVE-2023-38148
- Windows 11 version 21H2: 18 vulnerabilities, 1 critical and 17 important
- Internet Connection Sharing (ICS) Remote Code Execution Vulnerability -- CVE-2023-38148
- Windows 11 version 22H2: 17 vulnerabilities, 1 critical and 16 important
- Internet Connection Sharing (ICS) Remote Code Execution Vulnerability -- CVE-2023-38148
Windows Server products
- Windows Server 2008 R2 (extended support only): 11 vulnerabilities: 0 critical and 11 important
- Windows Server 2012 R2: 13 vulnerabilities: 0 critical and 13 important
- Windows Server 2016: 16 vulnerabilities: 0 critical and 16 important
- Windows Server 2019: 18 vulnerabilities: 0 critical and 18 important
- Windows Server 2022: 19 vulnerabilities: 1 critical and 18 important.
- Internet Connection Sharing (ICS) Remote Code Execution Vulnerability -- CVE-2023-38148
Windows Security Updates
Windows 10 version 22H2
- Support Page: KB5030211
Updates and improvements:
- Security updates.
- The update fixes an authentication issue that could lead to failed join or rejoin attempts when using a smart card.
- All changes of the August 22 preview update. Highlights include
- Location detection is improved.
- Notification badges rollout is expanded, which adds badges (some would say ads) to the profile icon in Start.
Windows 11 Release version
- Support Page: KB5030217
Updates and improvements:
- Security updates.
- The update fixes an authentication issue that could lead to failed join or rejoin attempts when using a smart card.
- All changes of the August 22 preview update. Highlights include:
- Location detection is improved.
Windows 11 version 22H2
- Support Page: KB5030219
Updates and improvements:
- Security updates.
- The update fixes an authentication issue that could lead to failed join or rejoin attempts when using a smart card.
- The update removes a "blank menu item" from the Sticky Keys menu.
- All changes of the August 22 preview update. Highlights include:
- Hover behavior returns to the Windows search box in the taskbar.
Other security updates
2023-09 Cumulative Security Update for Internet Explorer (KB5030209)
2023-09 Security Only Quality Update for Windows Embedded Standard 7 and Windows Server 2008 R2 (KB5030261)
2023-09 Security Monthly Quality Rollup for Windows Embedded Standard 7 and Windows Server 2008 R2 (KB5030265)
2023-09 Security Monthly Quality Rollup for Windows Server 2012 R2 (KB5030269)
2023-09 Security Monthly Quality Rollup for Windows Server 2008 (KB5030271)
2023-09 Security Monthly Quality Rollup for Windows Server 2012 (KB5030278)
2023-09 Security Only Quality Update for Windows Server 2012 for x64-based Systems (KB5030279)
2023-09 Security Only Quality Update for Windows Server 2008 (KB5030286)
2023-09 Security Only Quality Update for Windows Server 2012 R2 for x64-based Systems (KB5030287)
2023-09 Cumulative security Hotpatch for Azure Stack HCI, version 21H2 and Windows Server 2022 Datacenter: Azure Edition for x64-based Systems (KB5030325)
2023-09 Dynamic Cumulative Update for Windows 10 Version 22H2 and Windows 10 Version 21H2 (KB5030211)
2023-09 Cumulative Update for Windows Server 2016 and Windows 10 Version 1607 (KB5030213)
2023-09 Cumulative Update for Windows Server 2019 and Windows 10 Version 1809 (KB5030214)
2023-09 Cumulative Update for Microsoft server operating system version 21H2 for x64-based Systems (KB5030216)
2023-09 Dynamic Cumulative Update for Windows 11 (KB5030217)
2023-09 Cumulative Update for Windows 10 Version 1507 (KB5030220)
Servicing Stack
2023-09 Servicing Stack Update for Windows Server 2012 R2 for x64-based Systems (KB5030329)
2023-09 Servicing Stack Update for Windows Server 2012 for x64-based Systems (KB5030330)
2023-09 Servicing Stack Update for Windows 10 Version 1507 (KB5030503)
2023-09 Servicing Stack Update for Windows Server 2016 and Windows 10 Version 1607 (KB5030504)
.NET
2023-09 Security and Quality Rollup for .NET Framework 3.5 for Windows Server 2012 R2 for x64 (KB5029915)
2023-09 Security and Quality Rollup for .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 for Windows Server 2012 R2 for x64 (KB5029916)
2023-09 Security and Quality Rollup for .NET Framework 4.8 for Windows Server 2012 R2 for x64 (KB5029917)
2023-09 Security and Quality Rollup for .NET Framework 4.8 for Windows Server 2012 for x64 (KB5029927)
2023-09 Security and Quality Rollup for .NET Framework 4.8 for Windows Embedded Standard 7 and Windows Server 2008 R2 (KB5029929)
2023-09 Security and Quality Rollup for .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 for Windows Server 2012 for x64 (KB5029932)
2023-09 Security and Quality Rollup for .NET Framework 4.6.2 for Windows Embedded Standard 7, Windows Server 2008 R2, and Windows Server 2008 (KB5029933)
2023-09 Security and Quality Rollup for .NET Framework 2.0, 3.0 for Windows Server 2008 (KB5029937)
2023-09 Security and Quality Rollup for .NET Framework 3.5.1 for Windows Embedded Standard 7 and Windows Server 2008 R2 (KB5029938)
2023-09 Security Only Update for .NET Framework 3.5 for Windows Server 2012 R2 for x64 (KB5029940)
2023-09 Security Only Update for .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 for Windows Server 2012 R2 for x64 (KB5029941)
2023-09 Security Only Update for .NET Framework 4.8 for Windows Server 2012 R2 for x64 (KB5029942)
2023-09 Security Only Update for .NET Framework 4.8 for Windows Server 2012 for x64 (KB5029943)
2023-09 Security Only Update for .NET Framework 4.8 for Windows Embedded Standard 7 and Windows Server 2008 R2 (KB5029944)
2023-09 Security Only Update for .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 for Windows Server 2012 for x64 (KB5029945)
2023-09 Security Only Update for .NET Framework 4.6.2, 4.7, 4.7.1, 4.7.2 for Windows Embedded Standard 7, Windows Server 2008 R2, and Windows Server 2008 (KB5029946)
2023-09 Security Only Update for .NET Framework 2.0, 3.0 for Windows Server 2008 (KB5029947)
2023-09 Security Only Update for .NET Framework 3.5.1 for Windows Embedded Standard 7 and Windows Server 2008 R2 (KB5029948)
2023-09 Security Only Update for .NET Framework 3.5 for Windows Server 2012 for x64 (KB5030030)
2023-09 Security and Quality Rollup for .NET Framework 3.5 for Windows Server 2012 for x64 (KB5030160)
2023-09 Security Only Update for .NET Framework 3.5.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Embedded Standard 7 and Windows Server 2008 R2 (KB5030173)
2023-09 Security Only Update for .NET Framework 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Server 2012 for x64 (KB5030174)
2023-09 Security Only Update for .NET Framework 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Server 2012 R2 for x64 (KB5030175)
2023-09 Security Only Update for .NET Framework 2.0, 3.0, 4.6.2 for Windows Server 2008 (KB5030176)
2023-09 Security and Quality Rollup for .NET Framework 3.5.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Embedded Standard 7 and Windows Server 2008 R2 (KB5030182)
2023-09 Security and Quality Rollup for .NET Framework 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Server 2012 for x64 (KB5030183)
2023-09 Security and Quality Rollup for .NET Framework 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8 for Windows Server 2012 R2 for x64 (KB5030184)
2023-09 Security and Quality Rollup for .NET Framework 2.0, 3.0, 4.6.2 for Windows Server 2008 (KB5030185)
2023-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 10 Version 22H2 and Windows 10 Version 21H2 (KB5029919)
2023-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11 (KB5029920)
2023-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11 (KB5029921)
2023-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Microsoft server operating system version 21H2 for x64 (KB5029922)
2023-09 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 22H2 and Windows 10 Version 21H2 (KB5029923)
2023-09 Cumulative Update for .NET Framework 4.8 for Windows Server 2016 and Windows 10 Version 1607 (KB5029924)
2023-09 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows Server 2019 and Windows 10 Version 1809 (KB5029925)
2023-09 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 11 (KB5029926)
2023-09 Cumulative Update for .NET Framework 3.5 and 4.8 for Microsoft server operating system, version 22H2 for x64 (KB5029928)
2023-09 Cumulative Update for .NET Framework 3.5 and 4.7.2 for Windows Server 2019 and Windows 10 Version 1809 (KB5029931)
2023-09 Cumulative Update for .NET Framework 3.5 and 4.8 for Microsoft server operating system, version 22H2 for x64 (KB5030177)
2023-09 Cumulative Update for .NET Framework 3.5, 4.7.2 and 4.8 for Windows Server 2019 and Windows 10 Version 1809 (KB5030178)
2023-09 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 10 Version 21H2 (KB5030179)
2023-09 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 22H2 (KB5030180)
2023-09 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 11 (KB5030181)
2023-09 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Microsoft server operating system version 21H2 for x64 (KB5030186)
2023-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11 (KB5031217)
Known Issues
- None!
Security advisories and updates
- ADV 990001 -- Latest Servicing Stack Updates
Non-security updates
Microsoft .NET Framework 4.8.1 for Microsoft server operating system, version 22H2, Windows 11, Windows 10 Version 22H2, and Windows 10 Version 21H2 (KB5011048)
2023-09 Dynamic Update for Windows 11 (KB5030326)
Microsoft Office Updates
You find Office update information here.
How to download and install the September 2023 security updates
Windows Update is configured to install security updates automatically on Home and non-managed devices. Some administrators may prefer to download and install the updates manually, which they may do in two ways: either by downloading them manually and running installers, or by running a manual check for updates.
Here are the required steps to run a manual check for updates. We recommend that you create system backups, for instance with the help of the free Paragon Backup & Recovery Community Edition.
- 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 10 version 22H2
- KB5030211 -- 2023-09 Cumulative Update for Windows 10 Version 21H2
Windows 11 Release version
- KB5030217 -- 2023-09 Cumulative Update for Windows 11
- KB5030219 -- 2023-09 Cumulative Update for Windows 11 version 22H2
Additional resources
- September 2023 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 11 Update History
- Windows 10 Update History
For a non-feature-update that took an incredibly long time to install on an old Win10 desktop… i started it and gave up waiting for it after more than two hours. Then it took another ten or twenty minutes to restart when I came back an hour later!
At the end of the update, it said: don’t turn off your computer, the system is cleaning up. Or something like that. Windows 10 Home, 22H2. I have never seen that before. Or I need new glasses.
I’m running Windows 10 22H2 x64.
Windows update downloaded the following:
KB5030559 .NET 6.0.22 Security Update
KB5030180 NET Framework 3.5, 4.8, and 4.8.1
KB5030211 Cumulative update for Windows 10 22H2
The first one wasn’t listed KB5030559
Oh look no direct links for W10 v21H2 updates which are still available for Sep ’23.
@ blahblah,
Support for 21H2 expired on June 30 this year that’s why. https://learn.microsoft.com/en-us/lifecycle/announcements/windows-10-21h2-end-of-servicing
Any updates you’re seeing somewhere will precede that expiry date.
Thank you very much for giving me such insight this month as well, so that I could gather the knowledge that would allow me to understand how to optimally secure my system.
Windows 10 pro, version 22H2, OS build 19045.3448.
I found it a good idea to wait for the Restart Now message before attempting to restart to complete Windows 11 Home (x64) Version 22H2 (build 22621.2283).
Out of curiosity, why would you use home version? It is missing certain things such as group policy editor, RDP, also sandbox mode.