Microsoft starts 2020 patch Tuesday with a BANG - Brian Krebs calls one of the vulnerability (fixed) as "extraordinarily serious security vulnerability". So, if we don't patch then, "Shame on Us".

It could have wide-ranging security implications for a number of important Windows
functions, including authentication on Windows desktops and servers, the protection of sensitive data handled by Microsoft’s Internet Explorer/Edge browsers, as well as a number of third-party applications and tools


Those sources say Microsoft has quietly shipped a patch for the bug to branches of the U.S. military and to other high-value customers/targets that manage key Internet infrastructure, and that those organizations have been asked to sign agreements preventing them from disclosing details of the flaw prior to Jan. 14, the first Patch Tuesday of 2020.


https://krebsonsecurity.com/2020/01/cryptic-rumblings-ahead-of-first-2020-patch-tuesday/