Note: this post is getting frequent updates; please keep checking back. Last update: 3/19/2021
Microsoft has released a set of out of band security updates for vulnerabilities for the following ver...
Updated Mar 19, 2021
Version 44.0
Blog Post
Just a heads-up for those doing the install on Ex2016 servers: Upgraded a single Ex2016 CU17 Standard and single Ex2016 CU17 Enterprise to CU19 last night, then installed KB5000871. Both CU19 installs borked my ECP & OWA workspaces; KB5000871 also failed to set the HostControllerService on both systems to Automatic, leaving it at Disabled. Today I re-downloaded CU19 and KB5000871 and reinstalled on our Ex2016 Enterprise box; the re-installation fixed the non-service issues I couldn't resolve on my own, and I verified that it was the KB5000871 installation that (again) disabled the HostControllerService and didn't re-enable it.
I plan to reinstall CU19 and KB5000871 on the already updated Ex2016 Standard box, and will update the #2 Ex2016 Enterprise server tomorrow night.
Be sure to check out your Services for any that were left Disabled as part of either installation AFTER rebooting and before taking the Exchange Server out of maintenance mode. Thanks.