July 13, 2021—KB5004238 (OS Build 14393.4530) - EXPIRED

EXPIRATION NOTICEAs of 9/12/2023, KB5004238 is no longer available from Windows Update, the Microsoft Update Catalog, or other release channels. We recommend that you update your devices to the latest security quality update.

**NEW 7/13/21
IMPORTANT **This release includes the Flash Removal Package. Taking this update will remove Adobe Flash from the machine. For more information, see the Update on Adobe Flash Player End of Support.

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 1607 update history home page.

Highlights

• Updates to remove Adobe Flash from your device.
• Updates for verifying usernames and passwords.
• Updates to improve security when Windows performs basic operations.

Improvements and fixes

This security update includes quality improvements. Key changes include:

• Removes support for the PerformTicketSignature setting and permanently enables Enforcement mode for CVE-2020-17049. For more information and steps to enable full protection on domain controller servers, see Managing deployment of Kerberos S4U changes for CVE-2020-17049.
• Addresses an issue that incorrectly renders some Enhanced Metafile Format (EMF) files. This issue occurs if you build the EMF files using third-party applications with ExtCreatePen() andExtCreateFontIndirect().
• Addresses a redirector stop error that is caused by a race condition that occurs when the system deletes binding objects when connections close.
• Removes the Adobe Flash component from your device.
• Adds Advanced Encryption Standard (AES) encryption protections for CVE-2021-33757. For more information, see KB5004605.
• Addresses a vulnerability in which Primary Refresh Tokens are not strongly encrypted. This issue might allow the tokens to be reused until the token expires or is renewed. For more information about this issue, see CVE-2021-33779.
• Security updates to Windows Apps, Windows Fundamentals, Windows Authentication, Windows User Account Control (UAC), Operating System Security, the Windows Kernel, Windows Graphics, the Microsoft Scripting Engine, the Windows HTML Platforms, the Windows MSHTML Platform, and Windows Active Directory.
  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 ImprovementsMicrosoft 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

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Click or tap to view the known issues

• 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, see Useful KMS client events - Event ID 12288 and Event ID 12289.| This issue is resolved in KB5010359.

How to get this update

KB5004238 is no longer available.