This latest warning to Windows users pertains to imminent perceived threats of attack from something named “Bluekeep.”

...In an advisory published this week, the NSA has urged "Microsoft Windows administrators and users to ensure they are using a patched and updated system in the face of growing threat." That threat being BlueKeep, which has already been the focus of multiple "update now" warnings from Microsoft itself.

The NSA warning comes off the back of research that revealed just under one million internet-facing machines are still vulnerable to BlueKeep on port 3389, used by the Microsoft Remote Desktop feature, with nobody knows how many devices at risk within the internal networks beyond. The potential is certainly there for this threat, if exploited, to be on the scale of WannaCry...
https://www.forbes.com/sites/daveywi.../#5a62f7fa3aa0