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This particular flaw is assigned as CVE-2020-0601. NSA says it exists in Win10 systems from July 2015 onward and Win Server 2016. My read on that is it's "critical" in those OSes, but may be present and less of a concern in older versions of Windows but we'll know more soon.
Sources say this disclosure from NSA is planned to be the first of many as part of a new initiative at NSA dubbed "Turn a New Leaf," aimed at making more of the agency's vulnerability research available to major software vendors and ultimately to the public.
The NSA's Neuberger said this wasn't the first vulnerability the agency has reported to Microsoft, but it was the first one for which they accepted credit/attribution when MS asked.
Microsoft has released an advisory for this vulnerability in Win10, Server 2016 and '19. It rated this as a "spoofing" flaw that is "important" in severity, but puts exploitability rating at 1, it's second most severe, i.e. "exploitation more likely." https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0601 …
NSA's advisory is here: https://twitter.com/NSAGov/status/1217152211056238593 … CERT/CC's take: https://kb.cert.org/vuls/id/849224/
In exchange for.......
It is probably a calculation. Fixing the vulnerabilities creates more defense, than using them creates offense. In other words, denying Russia, Iran, and NK access by patching is more valuable than hacking them with these vulns.
That will be a welcome change, because they've been sitting on zero days they were supposed to disclose.
Their honeis caught it being used by RU hence the proper disclosure? 
Aka we are done with this 0 day, feel free to patch now
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