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Release Date:

8/06/2021

Version:

OS Build 18363.1621

5/11/21
REMINDER Windows 10, version 1909 reached  end of service on May 11, 2021 for devices running the Home, Pro, Pro for Workstation, Nano Container, and Server SAC editions. After May 11, 2021, these devices will no longer receive monthly security and quality updates that contain protection from the latest security threats. To continue receiving security and quality updates, Microsoft recommends updating to the latest version of Windows 10.

We will continue to service the following editions: Enterprise, Education, and IoT Enterprise.

4/13/21
REMINDER
Microsoft removed the Microsoft Edge Legacy desktop application that is out of support in March 2021. In the April 13, 2021 release, we installed the new Microsoft Edge. For more information, see New Microsoft Edge to replace Microsoft Edge Legacy with April’s Windows 10 Update Tuesday release.

11/19/20
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 1909 update history home page.

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

Note This release also contains updates for Microsoft HoloLens (OS Build 18363.1116) released June 8, 2021. Microsoft will release an update directly to the Windows Update Client to improve Windows Update reliability on Microsoft HoloLens that have not updated to this most recent OS Build.

Highlights

  • Updates to improve security when Windows performs basic operations.

  • Updates to improve Windows OLE (compound documents) security.

  • Updates for verifying usernames and passwords.

  • Updates for storing and managing files.

  • Updates to improve security when using input devices such as a mouse, keyboard, or pen.

  • Updates an issue that might prevent you from signing in to some Microsoft 365 desktop client apps after installing the May 11, 2021 or later update and restarting your device.

Improvements and fixes

This security update includes quality improvements. Key changes include:

  • Addresses an issue with an inconsistent shutdown during Windows Update that damages the Windows Management Instrumentation (WMI) repository. As a result, the Managed Object Format (MOF) Advance Installer fails.

  • Addresses an issue that might prevent you from signing in to some Microsoft 365 desktop client apps after installing the May 11, 2021 or later update and restarting your device. You might also receive an 80080300 error or "We ran into a problem. Reconnecting…" when attempting to authenticate or sign in to Teams.

  • Security updates to the Microsoft Scripting Engine, Windows App Platform and Frameworks, Windows Input and Composition, Windows Management, Windows Cloud Infrastructure, Windows Authentication, Windows Fundamentals, Windows Virtualization, Windows Kernel, Windows HTML Platform, and Windows Storage and Filesystem.

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

For more information about the resolved security vulnerabilities, please refer to the new Security Update Guide website.

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.

Known issues in this update

Symptom

Workaround

After installing this or later updates, apps accessing event logs on remote devices might be unable to connect. This issue might occur if the local or remote has not yet installed updates released June 8, 2021 or later. Affected apps are using certain legacy Event Logging APIs. You might receive an error when attempting to connect, for example:

  • error 5: access is denied 

  • error 1764: The requested operation is not supported.

  • System.InvalidOperationException,
    Microsoft.PowerShell.Commands.GetEventLogCommand

  • Windows has not provided an error code.

Note Event Viewer and other apps using current non-legacy APIs to access event logs should not be affected.

This is expected due to security hardening changes relating to Event Tracing for Windows (ETW) for CVE-2021-31958. This issue is resolved if the local and remote devices both have installed updates released June 8, 2021 or later.

After installing this update or later, the news and interests button in the Windows taskbar might have blurry text on certain display configurations.

This issue is resolved in KB5003698.

How to get this update

Before installing this update

Prerequisite:

You must install the April 13, 2021 servicing stack update (SSU) (KB5001406) or the latest SSU (KB5003710) before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU and applying Microsoft security fixes. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

If you are using Windows Update, the latest SSU will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.

Install this update

Release Channel

Available

Next Step

Windows Update and Microsoft Update

Yes

None. This update will be downloaded and installed automatically from Windows Update.

Windows Update for Business

Yes

None. This update will be downloaded and installed automatically from Windows Update in accordance with configured policies.

Microsoft Update Catalog

Yes

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

Windows Server Update Services (WSUS)

Yes

This update will automatically sync with WSUS if you configure Products and Classifications as follows:

Product: Windows 10, version 1903 and later

Classification: Security Updates

File information

For a list of the files that are provided in this update, download the file information for cumulative update 5003635

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