A severe vulnerability is discovered in one of the core components of Windows. Microsoft has since released an urgent out-of-band patch to all affected machines.
“Microsoft is aware of a remote code execution vulnerability in the way that the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles certain requests. An attacker who successfully exploited the vulnerability could gain the ability to execute code on the target SMB Server or SMB Client.” reads the advisory published by Microsoft.
Source: Microsoft accidentally reveals Wormable Win SMBv3 CVE-2020-0796 FlawSecurity Affairs