Applies To
Windows 10 Enterprise and Education, version 21H2 Windows 10 IoT Enterprise, version 21H2 Windows 10 Enterprise Multi-Session, version 21H2 Windows 10, version 22H2, all editions

Release Date:

10/10/2023

Version:

OS Builds 19044.3570 and 19045.3570

EXPIRATION NOTICE

IMPORTANT As of March 31, 2026, this update is no longer available from the Microsoft Update Catalog or other release channels. We recommend that you update your devices to the latest version of Windows.

 

11/17/20

For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. For an overview of Windows 10, version 21H2, see its update history page. 

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

Highlights

  • This update addresses security issues for your Windows operating system. 

Improvements 

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

Important: Use EKB KB5015684 to update to Windows 10, version 22H2.

This security update includes quality improvements. Key changes include: 

  • This build includes all the improvements from the supported Windows 10, version 21H2 editions.

  • No additional issues are documented for this release. 

Important: Use EKB KB5003791 to update to Windows 10, version 21H2 on supported editions.

This security update includes quality improvements that were a part of update KB5030300 (released September 26, 2023). When you install this KB:

  • To protect against CVE-2023-44487, you should install the latest Windows update. Based on your use case, you can also set the limit of the RST_STREAMS per minute using the new registry keys in this update. 

    You can create the DWORD registry values in the table below under the following registry key: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HTTP\Parameters

    These keys are not present by default when you install this KB. You can create them as required to set new values for your environment.

    Registry key

    Default value

    Valid value range

    Registry key function

    Http2MaxClientResetsPerMinute

    400

    0–65535

    Sets the allowed number of resets (RST_STREAMS) per minute for a connection. When you reach this limit, a GOAWAY message is sent to client for the connection.

    Http2MaxClientResetsGoaway

    1

    0-1

    Disables or enables the GOAWAY message to send when you reach the limit. If you set this to 0, the connection ends as soon as you reach the limit.

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 October 2023 Security Updates. 

Windows 10 servicing stack update - 19044.3562 and 19045.3562

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

Symptom

Workaround

Using the FixedDrivesEncryptionType or SystemDrivesEncryptionType policy settings in the BitLocker configuration service provider (CSP) node in mobile device management (MDM) apps might incorrectly show a 65000 error in the "Require Device Encryption" setting for some devices in your environment. Affected environments are those with the “Enforce drive encryption type on operating system drives” or "Enforce drive encryption on fixed drives" policies set to enabled and selecting either "full encryption" or "used space only". Microsoft Intune is affected by this issue but third-party MDMs might also pe affected.

Important This issue is a reporting issue only and does not affect drive encryption or the reporting of other issues on the device, including other BitLocker issues.

This issue is addressed in KB5034203.

This update might not be installed successfully. Devices might initially display progress, but then not finish the installation.

A common error code encountered with this issue is Error 8007000D (ERROR_INVALID_DATA). This error can be found in Update History.

To view your update history, select Start > Settings > Windows Update > Update history.

This issue is resolved by using Known Issue Rollback (KIR). Please realize that it might require up to 48 hours for the resolution to propagate automatically to consumer devices and unmanaged business devices.

If necessary, use the following steps to resolve this issue:

  1. ​Run Command Prompt as Administrator.

  2. ​In the Command Prompt window, type the following command: Dism /online /cleanup-image /RestoreHealth

  3. ​Wait for the process to complete successfully, and then close the windows.

  4. Install this update. To do this, select Start > Settings > Windows Update > Check for updates.

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. The special Group Policy can be found in Computer Configuration > Administrative Templates > <Group Policy name listed below>. For information on deploying and configuring these special Group Policy, please see How to use Group Policy to deploy a Known Issue Rollback.

Group Policy downloads with Group Policy name:

How to get this update

EXPIRATION NOTICE

IMPORTANT As of March 31, 2026, this update is no longer available from the Microsoft Update Catalog or other release channels. We recommend that you update your devices to the latest version of Windows.

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