[German]On September 9, 2025 (the second Tuesday of the month, Microsoft's patch day), various cumulative updates were released for the supported versions of Windows Server. Below, I have listed the updates provided, along with some details for these Windows Server versions (from Windows Server 2012 to 2025).
The updates listed below address the vulnerabilities described in Microsoft Security Update Summary (September 9, 2025) that are relevant to Windows Server.
Updates for Windows Server 2025
A list of updates for Windows Server 2025 can be found on this Microsoft website. The cumulative update KB5065426 has been released for Windows Server 2025, which includes the security patches described in the support article and the following fixes.
This updates closed a memory leak. Furthermore, the UAC bug when calling up software such as AutoCAD by standard users has been fixed (see Microsoft confirms UAC issue in Windows after August 2025 update). This update enabled the verification of SMB client compatibility for SMB server signing and for SMB Server EPA. Details can be found in support article KKB5065426 .
This update is automatically downloaded and installed by Windows Update, but is also available in the Microsoft Update Catalog and via WSUS and WUfB. The current Windows Servicing Stack Update is integrated into the patch. Any problems caused by the update and installation requirements are listed in the support article.
Updates for Windows Server 2022/23H2
The following updates are available for Windows Server 2022 and Windows Server 23H2.
Update KB5065425 for Windows Server 23H2
A list of updates for Windows Server 23H2 can be found on this Microsoft website. The cumulative update KB5065425 has been released for Windows Server 23H2, which includes the security patches described in the support article.
There are quite a few bugs that have been fixed, including the fixes for the UAC error and SMB client compatibility described in update KB5065426. Check out the support article for more details.
This update is automatically downloaded and installed by Windows Update, but is also available in the Microsoft Update Catalog and via WSUS and WUfB. The current Windows Servicing Stack Update is integrated into the patch. Any problems caused by the update (Citrix) and installation requirements are listed in the support article.
Update KB5065432 for Windows Server 2022
A list of updates for Windows Server 2022 can be found on this Microsoft website. The cumulative update KB5065432 has been released for Windows Server 2022, which includes security patches and those described in the support article. These also include the fixes described in update KB5065426 for the UAC error or SMB client compatibility. Details can be found in the linked KB article.
This update is automatically downloaded and installed by Windows Update, but is also available in the Microsoft Update Catalog and via WSUS and WUfB. The current Windows Servicing Stack Update is integrated into the patch. Any problems caused by the update and installation requirements are listed in the support article.
Updates for Windows Server 2016/2019
A list of updates for Windows Server 2016 and 2019 can be found on this Microsoft website. I have extracted the relevant update information below.
Update KB5065428 for Windows Server 2019
Cumulative Update KB5065428 is not only available for Windows 10 2019 Enterprise LTSC etc., but also for Windows Server 2019. The update includes the security fixes described in the support article, as well as improvements and bug fixes (switch to the Server 2019 tab).
The update is automatically downloaded and installed by Windows Update, but is also available in the Microsoft Update Catalog, via WSUS, and WUfB. Microsoft has also updated the Service Stack Update (SSU). Please note the installation sequence described in the support article, as well as any notes on additional requirements and potential issues.
Update KB5063871 for Windows Server 1607
Cumulative Update KB5065427 is available not only for Windows 10 2016 Enterprise LTSC, but also for Windows Server 2016. The update includes security fixes, bug fixes, and improvements, which may be listed in the support article.
The update is automatically downloaded and installed by Windows Update, but is also available in the Microsoft Update Catalog, via WSUS, and WUfB. Microsoft has also updated the Service Stack Update (SSU). Please note the installation requirements described in the support article and any references to existing issues.
Updates for Windows Server 2012 / R2
Windows Server 2012/R2 will no longer be supported as of October 2023 and will only receive updates with an ESU license. Please note the instructions on the installation sequence for Windows Server provided by Microsoft in the KB articles. The installation of this extended security update (ESU) may fail if installed on an Azure Arc-enabled device.
Update KB5065507 for Windows Server 2012 R2
The update history for Windows Server 2012 R2 can be found on this Microsoft page. Update KB5065507 (Monthly Rollup for Windows Server 2012 R2) has been released for Windows Server 2012 R2 for systems with an ESU license. The update eliminates various vulnerabilities and includes internal, undocumented fixes.
This update is automatically downloaded and installed by Windows Update in Windows Server 2012 R2, but is also available in the Microsoft Update Catalog and via WSUS. Details about fixes and any known issues related to the update are listed in the support article.
Update KB5065509 for Windows Server 2012
The update history for Windows Server 2012 can be found on this Microsoft page. Update KB5065509 (Monthly Rollup for Windows Server 2012) has been released for Windows Server 2012 with an ESU license. It contains unspecified security patches and bug fixes.
This update is available in the Microsoft Update Catalog and via WSUS. For manual installation, the latest Servicing Stack Update (SSU) must be installed first – this SSU cannot be uninstalled. Problems related to the update are listed in the KB article.
If in doubt, details on the above updates can be found in the respective Microsoft KB articles.
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