krebsonsecurity[.]com/2020/01/cryptic-rumblings-ahead-of-first-2020-patch-tuesday/
Install today's update ASAP once it's released [1:00 pm Eastern]. Allegedly the NSA found a serious flaw in a core part of Windows security, and the fix is due out today.
According to the NSA Microsoft has not seen the bug exploited in the wild, but expect that to change once details of the flaw & its patch are disclosed later today.