https://techcrunch.com/2020/03/12/microsoft-releases-emergency-patch-for-leaked-windows-10-security-bug/

Microsoft has released a Windows patch for a security vulnerability that was prematurely disclosed earlier this week.

Details of the “critical”-rated bug were released on Tuesday as part of the software giant’s typical monthly release of security patches, what it calls Patch Tuesday. The bug exists in the latest version of Windows’ server message block, known as SMB, which lets Windows communicate with devices, like printers and file servers, on the network and across the internet.