Table of contents
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Release Date:

9/30/2021

Version:

OS Builds 19041.1266, 19042.1266, and 19043.1266

11/17/20

For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. To view other notes and messages, see the Windows 10, version 2004  update history page.


Note Follow @WindowsUpdate to find out when new content is published to the release information dashboard.

 Highlights

  • Updates an issue that causes the system clock to be wrong by one hour after a daylight saving time (DST) change.  

  • Updates an issue that causes applications, such as Microsoft Outlook, to suddenly stop working during normal use.

  • Updates an issue with the Microsoft Outlook Add-in that prevents you from typing a reply. 

  • Updates an issue that causes blurry News and interests icons when you use certain screen resolutions.

  • Updates an issue that causes News and interests to appear when you right-click the taskbar even if you have turned off that feature on your device.

  • Updates an issue that might cause distortion in the sound that Cortana and other voice assistants record. 

  • Updates an issue that causes your device to stop working after you restart it.

  • Updates an issue that prevents you from providing input to apps when the taskbar is not at the bottom of the screen. 

Improvements and fixes

Note: To view the list of addressed issues, click or tap the OS name to expand the collapsible section.

This non-security update includes quality improvements. Key changes include:

  • This build includes all the improvements from Windows 10, version 2004.

  • No additional issues were documented for this release.

This non-security update includes quality improvements. Key changes include:

  • This build includes all the improvements from Windows 10, version 2004.

  • No additional issues were documented for this release.

This non-security update includes quality improvements. Key changes include:

  • Addresses an issue that changes the device’s current UI language. This occurs during an unattended out-of-box experience (OOBE) language pack installation scenario on a desktop.

  • Addresses an issue that causes the system time to be incorrect by one hour after a daylight saving time (DST) change.

  • Addresses an issue that causes the Server Manager application to disappear after you use it to remove Hyper-V features on Windows Server 2022.

  • Addresses an issue with parsing time formats in event logs. This issue occurs when you exclude milliseconds.

  • Addresses an issue that causes the DnsCache service to increase the CPU usage to 100% utilization. As a result, the device stops responding.

  • Provides administrators the option to reset the zoom to the default for HTML dialogs in Microsoft Edge Internet Explorer mode.

  • Addresses an issue with Enterprise Mode Site List redirection from Internet Explorer 11 to Microsoft Edge. In certain circumstances, the redirection opens a site in multiple tabs in Microsoft Edge.

  • Addresses an issue with PropertyGet in JScript9.dll.

  • Addresses an issue that stops calls to the Windows Image Acquisition (WIA) minidriver for Windows Portable Devices (WPD) devices that you access using WIAMgr.

  • Addresses an issue that causes applications, such as Microsoft Outlook, to suddenly stop responding during normal use. This occurs if the application created and removed UI elements on a background thread that is no longer receiving messages.

  • Addresses an issue with the Microsoft Outlook Add-in that prevents you from providing input after you select Reply.

  • Addresses an issue that fails to keep the NumLock state after a Fast Startup restart.

  • Addresses an issue with sharing a screen using Microsoft Teams. Protected content, such as a digital rights management (DRM) email, appears black for the presenter, but appears transparent for everyone else.

  • Addresses an issue that might prevent drawing on the screen using Windows Context::UpdateRgnFromRects from working.

  • Addresses an issue that always reports the update build revision (UBR) as zero (0) on a device during enrollment to mobile device management (MDM) service.

  • Addresses an issue that might cause distortion in the audio that Cortana and other voice assistants capture.

  • Removes the limitation of 25 maximum Traffic Selectors in the Windows native Internet Key Exchange (IKE) client and server. 

  • Addresses an issue that fails to display the smart card PIN dialog when you are connected to a virtual private network (VPN). This issue occurs after upgrading to Windows 10, version 2004.

  • Addresses an issue that causes a memory leak in lsass.exe when the pTokenPrivileges buffer is not released.

  • Addresses an issue with a non-paged pool (NPP) leak from the UxSF pool tag. This leak occurs when lsass.exe stops processing asynchronous Security Support Provider Interface (SSPI) calls.

  • Addresses an issue that prevents the xhunter1.sys driver from loading. As a result, some games cannot run when you enable Hypervisor-Protected Code Integrity (HVCI).

  • Addresses an issue that causes Windows to stop working if you deploy a Code Integrity policy without user mode rules.

  • Improves the performance of MsSense.exe in environments with User Datagram Protocol (UDP) applications that require high amounts of bandwidth.

  • Addresses an input method editor (IME) mode instability in the RemoteApp scenario. You must install this update on the Remote Desktop server and Remote Desktop client.

  • Addresses an issue that causes blurry News and interests icons when you use certain screen resolutions.

  • Addresses a paged pool memory leak of the registry keys for the Virtual Desktop ID that occurs in explorer.exe.

  • Removes a hyperlink that might cause the Input app to stop working when you first enter fuzzy pinyin content.

  • Addresses an activation issue for the Input application.

  • Addresses an issue that causes LogonUI.exe to stop working because Direct Manipulation fails to start.

  • Addresses an issue that causes News and interests to appear in the context menu even when you have disabled it on a device.

  • Addresses an issue that causes the configuration for multiple artifact DB support across datacenters to fail for Security Assertion Markup Language (SAML) artifacts.

  • Addresses an issue that causes the LsaLookupSids() function to fail. This occurs when there are security identifiers (SID) for users that no longer exist in a group that contains cross-domain trusted users.

  • Addresses an issue that fails to apply the post_logout_redirect_uri= parameter when you use an External Claims Provider.

  • Addresses an issue with a deadlock in the WebDav redirector that occurs when it attempts to read a file from the local TfsStore. As a result, the system stops responding.

  • Addresses an issue that causes a stop error after a restart.

  • Addresses an issue that causes apps to lose focus when the taskbar is not at the bottom of the screen.

  • Implements a Group Policy setting for the following registry value:

    Registry location:  HKLM\Software\Policies\Microsoft\Windows NT\Printers\PointAndPrint

    Value name: RestrictDriverInstallationToAdministrators

    Value data: 1

    For more information, see KB5005652.

  • Adds the ability to configure period or dot (.) delimited IP addresses interchangeably with fully qualified host names in the following Group Policy settings:

  • Addresses a known issue that might prevent devices from downloading and installing printer drivers when the devices attempt to connect to a network printer for the first time. We have observed this issue on devices that access printers using a print server that uses HTTP connections.

If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.

Windows Update Improvements

Microsoft has released an update directly to the Windows Update client to improve reliability. Any device running Windows 10 configured to receive updates automatically from Windows Update, including Enterprise and Pro editions, will be offered the latest Windows 10 feature update based on device compatibility and Windows Update for Business deferral policy. This doesn't apply to long-term servicing editions.

Windows 10 servicing stack update - 19041.1220, 19042.1220, and 19043.1220

  • This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates.

Known issues in this update

Symptoms

Workaround

Devices with Windows installations created from custom offline media or custom ISO image might have Microsoft Edge Legacy removed by this update, but not automatically replaced by the new Microsoft Edge. This issue is only encountered when custom offline media or ISO images are created by slipstreaming this update into the image without having first installed the standalone servicing stack update (SSU) released March 29, 2021 or later.

Note Devices that connect directly to Windows Update to receive updates are not affected. This includes devices using Windows Update for Business. Any device connecting to Windows Update should always receive the latest versions of the SSU and latest cumulative update (LCU) without any extra steps.

To avoid this issue, be sure to first slipstream the SSU released March 29, 2021 or later into the custom offline media or ISO image before slipstreaming the LCU. To do this with the combined SSU and LCU packages now used for Windows 10, version 20H2 and Windows 10, version 2004, you will need to extract the SSU from the combined package. Use the following steps to extract the using SSU:

  1. Extract the cab from the msu via this command line (using the package for KB5000842 as an example): expand Windows10.0-KB5000842-x64.msu /f:Windows10.0-KB5000842-x64.cab <destination path>

  2. Extract the SSU from the previously extracted cab via this command line: expand Windows10.0-KB5000842-x64.cab /f:* <destination path>

  3. You will then have the SSU cab, in this example named SSU-19041.903-x64.cab. Slipstream this file into your offline image first, then the LCU.

If you have already encountered this issue by installing the OS using affected custom media, you can mitigate it by directly installing the new Microsoft Edge. If you need to broadly deploy the new Microsoft Edge for business, see Download and deploy Microsoft Edge for business

After installing the June 21, 2021 (KB5003690) update, some devices cannot install new updates, such as the July 6, 2021 (KB5004945) or later updates. You will receive the error message, "PSFX_E_MATCHING_BINARY_MISSING".

For more information and a workaround, see KB5005322.

After installing KB5005565, installation of printers using Internet Printing Protocol (IPP) might not complete successfully. Devices which had connected to and installed the printer prior to the installation of KB5005565 are unaffected and print operations to that printer will succeed as usual.

Note IPP is not commonly used by devices designed for home use. Printing environments affected by this issue are more commonly found in enterprises and organizations.

Microsoft is working on a resolution and targeting its release in a future update.

After installing this update on a print server, printing properties defined on that server might not be correctly provided to clients. Note this issue is specific to print servers and does not impact standard network printing. This issue will not cause printing operations to fail, however, custom settings defined on the server – for example, duplex print settings – will not be applied automatically, and clients will print with default settings only.

This issue results from an improper building of the data file which contains the printer properties. Clients which receive this data file will not be able to use the file content and will instead proceed with default printing settings. Clients who have previously received the settings package prior to the installation of KB5005611 are unaffected. Servers which use default print settings and have no custom settings to provide to clients are unaffected.

Note The printer connection methods described in this issue are not commonly used by devices designed for home use. Printing environments affected by this issue are more commonly found in enterprises and organizations.

This issue is resolved in KB5006670.

After installing this update, when connecting to devices in an untrusted domain using Remote Desktop, connections might fail to authenticate when using smart card authentication. You might receive the prompt, "Your credentials did not work. The credentials that were used to connect to [device name] did not work. Please enter new credentials." and "The login attempt failed" in red

This issue is resolved using Known Issue Rollback (KIR). Please note that it might take up to 24 hours for the resolution to propagate automatically to non-managed personal devices and non-managed business devices. Restarting your Windows device might help the resolution apply to your device faster. For enterprise-managed devices that have installed an affected update and encountered this issue, it can be resolved by installing and configuring a special Group Policy linked below. Note Devices need to be restarted after configuring the special Group Policy. For help, please see How to use Group Policy to deploy a Known Issue Rollback. For general information on using Group Policies, see Group Policy Overview.

Group Policy installation files:

Important Verify that you are using the correct Group Policy for your version of Windows.

After installing this update, you might receive a prompt for administrative credentials every time you attempt to print in environments in which the print server and print client are in different times zones.

Note The affected environments described in this issue are not commonly used by devices designed for home use. The printing environments affected by this issue are more commonly found in enterprises and organizations.

This issue is resolved in KB5006670.

How to get this update

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:

For Windows Server Update Services (WSUS) deployment or when installing the standalone package from Microsoft Update Catalog:

If your devices do not have the May 11, 2021 update (KB5003173) or later LCU, you must install the special standalone August 10, 2021 SSU (KB5005260).

Install this update

Release Channel

Available

Next Step

Windows Update or Microsoft Update

Yes

Go to Settings Update & Security > Windows Update. In the Optional updates available area, you’ll find the link to download and install the update.

Windows Update for Business

No

None. These changes will be included in the next security update to this channel.

Microsoft Update Catalog

Yes

To get the standalone package for this update, go to the Microsoft Update Catalog website.

Windows Server Update Services (WSUS)

No

You can import this update into WSUS manually. See the Microsoft Update Catalog for instructions.

If you want to remove the LCU

To remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument. You can find the package name by using this command: DISM /online /get-packages.

Running Windows Update Standalone Installer (wusa.exe) with the /uninstall switch on the combined package will not work because the combined package contains the SSU. You cannot remove the SSU from the system after installation.

File information

For a list of the files that are provided in this update, download the file information for cumulative update 5005611

For a list of the files that are provided in the servicing stack update, download the file information for the SSU - version 19041.1220, 19042.1220, and 19043.1220

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