https://wccftech.com/kb4551762-out-of-band-security-patch-windows-10/

Earlier this week, details of a security vulnerability in the Microsoft Server Message Block 3.1.1 (SMB) were prematurely leaked by security vendors. Only two days and the Windows maker has already issued a Windows 10 update delivering the fix for the bug.

The details were inadvertently disclosed on Patch Tuesday as part of the regular monthly security patches. The issue affects Windows 10 versions 1909 and 1903 along with Windows Server versions 1909 and 1903 (Server Core installation). This remote code execution flaw could allow an attacker to remotely run malicious code on a vulnerable computer.