Microsoft releases Windows 10 build 18363.720 with SMBv3 fix

Patch Tuesday was just two days ago, but while all supported versions of Windows 10 were updated, there was a notable security vulnerability that was not fixed. So today, Windows 10 users on version 1903 or 1909 will get KB4551762, a new cumulative update that brings the build number to 18362.720 or 18363.720, respectively.

The only fix is for the SMBv3 security vulnerability. Here's the highlight:

  • Updates a network communication protocol issue that provides shared access to files, printers, and serial ports.

And here's the fix:

  • Security update to the Microsoft Server Message Block 3.1.1 (SMBv3).

There's also one known issue to be aware of, which was also included in the update for earlier this week.

Symptom Workaround
When using Windows Server containers with the March 10, 2020 updates, you might encounter issues with 32-bit applications and processes. For important guidance on updating Windows containers, please see Windows container version compatibility.


Unlike most mid-stream updates that take place between Patch Tuesdays, this one is not optional. It's mandatory, so you can either install it manually, get it through Windows Update, or it will install automatically in the background at some point. This is a cumulative update, so if you still haven't installed this week's Patch Tuesday update, you'll just get this one instead.

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