Today Microsoft released a new cumulative security update KB4601319. This update will up your build number to .804.

This update will also be available to Windows Insiders in the Beta and Release Preview Channels who are on 20H2.

After upgrading you will see one of the following build numbers. Windows 10 21H1 19043.804, Windows 10 20H2 19042.804 and Windows 10 2004 19041.804.

This security update includes quality improvements. Key changes include:

  • We fixed a possible elevation of privilege vulnerability in the win32k component.
  • We fixed an issue that might damage the file system of some devices and prevent them from starting up after running chkdsk /f.
  • We fixed a security vulnerability by preventing applications that run as a SYSTEM account from printing to “FILE:” ports. To address this issue in the future, make sure your applications or services run as a specific user or service account.
  • Security updates to the Windows App Platform and Frameworks, Windows Apps, Windows Input and Composition, Windows Cloud Infrastructure, Windows Management, Windows Authentication, Windows Fundamentals, Windows Cryptography, Windows Virtualization, Windows Core Networking, and Windows Hybrid Cloud Networking.

Download: x86-KB4601319
Download: x64-KB4601319
Download: arm-KB4601319
Download: Update Catalog

MS Support Notes: Read Me