Mitigation instructions available
Email stuck in Microsoft Exchange transport queues.
“The problem relates to a date check failure with the change of the new year and is not a failure of the AV engine itself,” according to the Microsoft Exchange Team.
On-premises Exchange Server 2016 and Exchange Server 2019.
The Microsoft Exchange team released an emergency fix (automated solution summarized below):
Set-ExecutionPolicy -ExecutionPolicy RemoteSigned
For manual remediation, the full mitigation steps are also available.
Contact Cornerstone.IT to help mitigate this vulnerability.