Windows 10 version 21H1 June 8 2021 update: Servicing stack and security improvements

Windows Update
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What you need to know

  • Patch Tuesday brings with it the latest updates for Windows 10.
  • 21H1 is now up to build 19043.1052 (KB5003637).
  • It packs lots of security updates.

It's that time of the month: 21H1 Build 19043.1052 (KB5003637) has been released to Insiders on 21H1 in the Beta Channel & Release Preview Channel. It's security-focused, as can be seen by the list of key changes Microsoft has provided. Here's what's gotten a security update:

  • 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
  • Windows Storage and Filesystems

As for the rest of the June changes in update KB5003637 (which packs OS Builds 19041.1052, 19042.1052, and 19043.1052 for Windows 10 versions 2004, 20H2, and 21H1), here are the highlights, according to Microsoft:

  • Updates to improve security when using input devices such as a mouse, keyboard, or pen.
  • Updates to improve Windows OLE (compound documents) security.
  • Updates for verifying usernames and passwords.
  • Updates to improve security when Windows performs basic operations.
  • Updates for storing and managing files.

This update also packs a servicing stack update. "This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates."

You can see the full list of changes via the above two source links, though these are the highlights. Not a massive Patch Tuesday, but at the same time, no one can complain about security and servicing stack upgrades.

Robert Carnevale

Robert Carnevale is the News Editor for Windows Central. He's a big fan of Kinect (it lives on in his heart), Sonic the Hedgehog, and the legendary intersection of those two titans, Sonic Free Riders. He is the author of Cold War 2395. Have a useful tip? Send it to