- KB5005112: 2021-08 Servicing Stack Update for Windows Server 2019 for x64-based Systems
- KB5005568: 2021-09 Cumulative Update for Windows Server 2019 for x64-based Systems
- KB5005573: 2021-08 Security Monthly Quality Rollup for Windows Server 2012 R2 for x64-based Systems
- KB5005613: 2021-09 Security Monthly Quality Rollup for Windows Server 2012 R2 for x64-based Systems
Impacted Products:
- Microsoft Windows
- Microsoft Windows
- Microsoft Edge (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
- Online Services
- Microsoft Dynamics
- .NET Framework
- .NET Core
Please note the following information regarding the security updates:
- For information regarding enabling Windows 10, version 1809 features and later, please see Windows 10, version 1909 delivery options. Note that Windows 10, versions 1903 and 1909 share a common core operating system with an identical set of system files. They will also share the same security update KBs. There is no change to the cumulative monthly security update
- Windows 10 updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows 10, in addition to non-security updates. The updates are available via the Microsoft Update Catalog.
- For information on lifecycle and support dates for Windows 10 operating systems, please see Windows Lifecycle Facts Sheet.
- A list of the latest servicing stack updates for each operating system can be found in ADV990001. This list will be updated whenever a new servicing stack update is released. It is important to install the latest servicing stack update.
- Updates for Windows RT 8.1 and Microsoft Office RT software are only available via Windows Update.
- In addition to security changes for the vulnerabilities, updates include defense-in-depth updates to help improve security-related features.
Known Issues:
KB5005112 Applies to: Windows 10 Enterprise 2019 LTSC Windows 10 IoT Enterprise 2019 LTSC Windows 10 IoT Core 2019 LTSC Windows Server 2019
Important: Windows 10, version 1809 reached end of service on May 11, 2021 for devices running the Enterprise, Education, and IoT Enterprise editions. After May 11, 2021, these devices will no longer be offered servicing stack updates. To continue receiving these updates, we recommend updating to the latest version of Windows 10.
KB5005568 – Applies to: Windows 10, version 1607, all editions Windows Server 2016, all editions
Improvements and fixes
This security update includes quality improvements. Key changes include:
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.
If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.
If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.
Before installing this update
Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
Prerequisite:
You must install the August 10, 2021 SSU (KB5005112) before installing the LCU.
KB5005573 – Applies to: Windows 10, version 1607, all editions Windows Server 2016, all editions
Improvements and fixes
This security update includes quality improvements. Key changes include:
Addresses an issue that prevents users from tracking Distributed Component Object Model (DCOM) activation failures.
Addresses an issue that might cause a memory leak to occur during prolonged Remote Desktop audio redirection.
Addresses an issue that causes a non-paged memory leak in the FLTMGR.SYS driver. This issue occurs because of a reference count issue in the DFS.SYS driver during cluster failover. As a result, the system might become unresponsive.
Addresses an issue with using the robocopy command with the backup option (/B) to fix copy failures. This issue occurs when the source files contain Alternate Data Streams (ADS) or Extended Attributes (EA) and the destination is an Azure Files share.
Addresses an issue that causes Authentication Mechanism Assurance (AMA) to stop working. This issue occurs when you migrate to Windows Server 2016 (or newer versions of Windows) and when using AMA in conjunction with certificates from Windows Hello for Business.
Addresses an issue that prevents you from writing to a Windows Management Instrumentation (WMI) repository after a low memory condition occurs.
If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.
KB5005613 – Applies to: Windows 10, version 1607, all editions Windows Server 2016, all editions
Improvements and fixes
This security update includes improvements and fixes that were a part of update KB5005076 (released August 10, 2021) and addresses the following issues:
This update contains miscellaneous security improvements to internal OS functionality. No additional issues were documented for this release.
Symptom
Certain operations, such as rename, that you perform on files or folders that are on a Cluster Shared Volume (CSV) may fail with the error, “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs when you perform the operation on a CSV owner node from a process that doesn’t have administrator privilege.
Workaround
Do one of the following:
Perform the operation from a process that has administrator privilege.
Perform the operation from a node that doesn’t have CSV ownership.
Microsoft is working on a resolution and will provide an update in an upcoming release.