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Applies To

Win 10 Ent LTSC 2019Win 10 IoT Ent LTSC 2019Windows 10 IoT Core LTSCWindows Server 2019

Release Date:

6/8/2021

Version:

OS Build 17763.1999

^5/11/21REMINDER 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 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 G, HoloLens, and the LTSC editions for Client, Server, and IoT.

^5/11/21REMINDERMicrosoft removed the Microsoft Edge Legacy desktop application that is out of support in April 2021. In the May 11, 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.

^11/17/20For information about Windows update terminology, see the article about thetypes of Windows updates and themonthly quality update types. To view other notes and messages, see the Windows 10, version 1809 update history home page.

NoteThis release also contains updates for Microsoft HoloLens (OS Build 17763.1999) 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.

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.
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 newSecurity 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 installingKB4493509, devices with some Asian language packs installed may receive the error, "0x800f0982 - PSFX_E_MATCHING_COMPONENT_NOT_FOUND."	This issue is addressed by updates releasedJune 11, 2019 and later. We recommend you install the latest security updates for your device. Customers installing Windows Server 2019 using media should install the latestServicing Stack Update (SSU) before installing the language pack or other optional components. If using theVolume Licensing Service Center (VLSC), acquire the latest Windows Server 2019 media available. The proper order of installation is as follows: Install the latest prerequisite SSU, currentlyKB5005112 Install optional components or language packs Install latest cumulative update Note Updating your device will prevent this issue, but will have no effect on devices already affected by this issue. If this issue is present in your device, you will need to use the workaround steps to repair it. Workaround: Uninstall and reinstall any recently added language packs. For instructions, seeManage the input and display language settings in Windows 10. ClickCheck for Updatesand install the April 2019 Cumulative Update or later. For instructions, seeUpdate Windows 10. NoteIf reinstalling the language pack does not mitigate the issue, use the In-Place-Upgrade feature. For guidance, seeHow to do an in-place upgrade on Windows, andPerform an in-place upgrade of Windows Server.
After installingKB5001342 or later, the Cluster Service might fail to start because a Cluster Network Driver is not found.	This issue occurs because of an update to the PnP class drivers used by this service. After about 20 minutes, you should be able to restart your device and not encounter this issue.For more information about the specific errors, cause, and workaround for this issue, please seeKB5003571.
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 certainlegacy 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 toEvent Tracing for Windows (ETW) forCVE-2021-31958. This issue is resolved if the local and remote devices both have installed updates released June 8, 2021 or later.
After installing updates released April 22, 2021 or later, an issue occurs that affects versions of Windows Server that are in use as a Key Management Services (KMS) host. Client devices running Windows 10 Enterprise LTSC 2019 and Windows 10 Enterprise LTSC 2016 might fail to activate. This issue only occurs when using a new Customer Support Volume License Key (CSVLK). Note This does not affect activation of any other version or edition of Windows. Client devices that are attempting to activate and are affected by this issue might receive the error, "Error: 0xC004F074. The Software Licensing Service reported that the computer could not be activated. No Key Management Service (KMS) could be contacted. Please see the Application Event Log for additional information." Event Log entries related to activation are another way to tell that you might be affected by this issue. OpenEvent Vieweron the client device that failed activation and go toWindows Logs>Application. If you see only event ID 12288 without a corresponding event ID 12289, this means one of the following: The KMS client could not reach the KMS host. The KMS host did not respond. The client did not receive the response. For more information on these event IDs, seeUseful KMS client events - Event ID 12288 and Event ID 12289.	This issue is resolved inKB5009616.

How to get this update

Before installing this update

Prerequisite:

You must install the May 11, 2021 servicing stack update (SSU) (KB5003243) or the latest SSU (KB5003711) 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, seeServicing 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 theMicrosoft 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 configureProducts and Classifications as follows: Product: Windows 10 Classification: Security Updates