Strange occurrence - Microsoft Out of Band update for Windows 10

 

June 11, 2021—KB5004476 (OS Builds 19041.1055, 19042.1055, and 19043.1055) Out-of-band

Windows 10, version 2004, all editions Windows Server version 2004 Windows 10, version 20H2, all editions Windows Server, version 20H2, all editions Windows 10, version 21H1, all editions 

Any out-of-band updates to all editions of Windows 10 with little warning or media coverage so soon after the Microsoft Patch Tuesday June 8 should raise concerns.

If you are wanting to patch, you will need to visit Windows Update and look for Optional Updates.

A number of Microsoft Defender signatures have had recent releases as well.