Flexis November 2025 Patch Recommendation
Patches Microsoft released in November 2025
- KB5068787: – 2025-11 Cumulative Update for Microsoft server operating system version 21H2 for x64-based Systems.
- KB5068791: – 2025-11 Cumulative Update for Windows Server 2019 (1809) for x64-based Systems
- KB5070247: – 2025-11 Servicing Stack Update for Windows Server 2016 for x64-based Systems
- KB5068864: – 2025-11 Cumulative Update for Windows Server 2016 for x64-based Systems
Impacted Products:
Microsoft Windows
Microsoft Edge
(HTML-based)
Microsoft Edge
(Chromium-based)
Internet Explorer
Microsoft Office and Microsoft Office Services and Web Apps
Windows Defender
Visual Studio
ASP.NET Core
Chakra Core
Microsoft Dynamics
.NET Framework
.NET Core
Please note the following information regarding the security updates:
Windows 10 Enterprise and Education and Windows 10 Home and Pro lifecycle pages, Windows 10 is ended on October 14, 2025. The current version, 22H2, will be the final version of Windows 10. The following editions will remain in support with monthly security update releases through that date:
Home
Pro
Pro Education
Pro for Workstations
Education
Enterprise
Enterprise multi-session
KB5068787: Windows Server 2022
Improvements
This security update contains fixes and quality improvements from KB5066782 (released October 14, 2025) and KB5070884 (released October 23, 2025). The following summary outlines key issues addressed by this update. Also, included are available new features. The bold text within the brackets indicates the item or area of the change.
- [Security] Fixed: This update addresses an issue that affects Windows Server domain controllers using Microsoft Defender for Endpoint. After domain controller promotion, changes to registry permissions disrupted cloud-based communication.
- [Networking] Fixed: This update fixes an issue in the HTTP.sys request parser, a Windows component that reads and processes HTTP requests. The parser allowed a single line break within HTTP/1.1 chunk extensions, where the RFC 9112 standard requires a carriage return and line feed (CRLF) sequence to terminate each chunk. This can cause a parsing discrepancy when front end proxies are a part of the setup.
To turn on strict parsing, use the following registry key:
Registry Key: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Http\Parameters]
Registry value: “HttpAllowLenientChunkExtParsing”=dword:00000000
Data to be set: 0
Known issues in this update
Windows Server Update Services (WSUS) does not display error details
After installing KB5070884 or later updates, Windows Server Update Services (WSUS) does not display synchronization error details within its error reporting. This functionality is temporarily removed to address the Remote Code Execution Vulnerability, CVE-2025-59287.
KB5068791: Win 10 Ent LTSC 2019 Windows Server 2019
Support for Windows Server 2019 will end in January 2029
After January 9, 2029, Microsoft will no longer provide free software updates from Windows Update, technical assistance, or security fixes for Windows Server 2019. We recommend that you upgrade to a later version of Windows Server.
Windows Secure Boot certificate expiration
Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in time. To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance. For details and preparation steps, see Windows Secure Boot certificate expiration and CA updates.
Summary
Windows 10 , Version 1809
Applies to: Windows 10 Enterprise LTSC 2021
This security update includes fixes and quality improvements that are part of the following update:
The following is a summary of the issues that this update addresses when you install this update. The bold text within the brackets indicates the item or area of the change we are documenting.
- [Internal Windows OS] This update contains miscellaneous security improvements to internal Windows OS functionality. No specific issues are documented for this release.
Windows Server 2019
Applies to: Windows Server 2019 (All editions)
This security update includes fixes and quality improvements that are part of the following update:
The following is a summary of the issues that this update addresses when you install this update. The bold text within the brackets indicates the item or area of the change we are documenting.
- [Internal Windows OS] This update contains miscellaneous security improvements to internal Windows OS functionality. No specific issues are documented for this release.
Known issues in this update
Microsoft is not currently aware of any issues with this update.
KB5070247: Windows Server 2016
Support for Windows 10 ended on 14th October 2025
After October 14, 2025, Microsoft will no longer provide free software updates from Windows Update, technical assistance, or security fixes for Windows 10. Your PC will still work, but we recommend moving to Windows 11.
Windows Secure Boot certificate expiration
Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in time. To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance. For details and preparation steps, see Windows Secure Boot certificate expiration and CA updates.
Summary
This servicing stack update (SSU) makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates make sure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates.
Important Not installing the latest SSU before applying Windows updates might result in the Windows update not being offered until the latest SSU is installed.
KB5068864: Win 10 Ent LTSB 2016 Windows Server 2016, all editions
Windows Secure Boot certificate expiration
Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in time. To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance. For details and preparation steps, see Windows Secure Boot certificate expiration and CA updates.
End of support information
Support for Windows Server 2016 will end in January 2027
After January 12, 2027, Microsoft will no longer provide free software updates from Windows Update, technical assistance, or security fixes for Windows Server 2016. We recommend that you upgrade to a later version of Windows Server.
Summary
Windows 10, version 1607
Applies to: Win 10 Ent LTSB 2016
This security update includes fixes and improvements that are a part of the following update:
[Internal Windows OS] This update contains miscellaneous security improvements to internal Windows OS functionality. No specific issues are documented for this release.
If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.
For more information about security vulnerabilities, please refer to the new Security Update Guide website and the November 2025 Security Updates.
For more information about Windows 10, version 1607, see its update history page.
Applies to: Windows Server 2016
This security update includes fixes and improvements that are a part of the following update:
The following is a summary of the issues that this update addresses. The bold text within the brackets indicates the item or area of the change we are documenting.
- [Internal Windows OS] This update contains miscellaneous security improvements to internal Windows OS functionality. No specific issues are documented for this release.
Known issues in this update
Microsoft is not currently aware of any issues with this update.