Fron SANS Internet Storm Center:

PATCH NOW - SIGRed - CVE-2020-1350 - Microsoft DNS Server Vulnerability
"Yesterday, Microsoft released a patch for CVE-2020-1350, fixing a critical vulnerability in it's DNS server. The vulnerability is 17 years old. All current versions of Microsoft's server back to 2003 are affected. The vulnerability earned a CVSS score of 10, indicating that it allows a full remote system compromise without any authentication. An exploit could likely spread without user interaction ("wormable")."

SANS Internet Storm Center