Critical Vulnerability in all Windows DNS Servers.

Microsoft have just put out an advisory and I strongly advise that you or your IT team action this workaround while you test patches as soon as possible, on dns servers and active directory servers. 
Basically this will allow an attacker to compromise an internal DNS server by clicking on a link. This is highly wormable and very likely to cause major disruption. 
More here on the workaround 

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1350