Microsoft promptly patched this week's 'wormable' Windows 10 flaw

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Just days after details leaked about a vulnerability, Microsoft sent out a fix.

Surface Laptop 3 15
Surface Laptop 3 15 (Image credit: Future)

What you need to know

  • New cumulative updates are available for Windows 10 1909 and 1903.
  • The updates address the wormable vulnerability that was recently discussed in online leaks.
  • The bug didn't affect any versions of Windows 10 older than 1903.

The fix addresses a wormable vulnerability that we reported on earlier this week. Details of the vulnerability leaked online ahead of Patch Tuesday, and a fix for it was not included in the Patch Tuesday updates. Now, Microsoft has addressed the issue. Here's the highlight, as listed by a Microsoft support page:

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

If you check the changelog from the support page, it lists the update to SMVv3 below Windows 10 version 1903 and not Windows 10 version 1909. That's because the two versions share a common core operating system and identical system files. Any changes listed in version 1903 are also available for version 1909.

Sean Endicott
Sean Endicott
News Writer and apps editor

Sean Endicott is a news writer and apps editor for Windows Central with 11+ years of experience. A Nottingham Trent journalism graduate, Sean has covered the industry’s arc from the Lumia era to the launch of Windows 11 and generative AI. Having started at Thrifter, he uses his expertise in price tracking to help readers find genuine hardware value.

Beyond tech news, Sean is a UK sports media pioneer. In 2017, he became one of the first to stream via smartphone and is an expert in AP Capture systems. A tech-forward coach, he was named 2024 BAFA Youth Coach of the Year. He is focused on using technology—from AI to Clipchamp—to gain a practical edge.