July 13, 2021—KB5004238 (OS Build 14393.4530)
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() and ExtCreateFontIndirect().
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.
Microsoft has released KB5004238 for Windows 10 version 1607 and Windows Server 2016.
