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Microsoft Exchange Y2K22 email delivery failure

January 3, 2022

Mitigation instructions available

Issue / Vulnerability

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.

Who Is Affected?

On-premises Exchange Server 2016 and Exchange Server 2019.

Remediation / Action Plan

The Microsoft Exchange team released an emergency fix (automated solution summarized below):

  • Download the script:
  • Before running the script, change the execution policy for PowerShell scripts by running Set-ExecutionPolicy -ExecutionPolicy RemoteSigned
  • Run the script on each Exchange mailbox server that downloads antimalware updates in your organization (use elevated Exchange Management Shell).

For manual remediation, the full mitigation steps are also available.

Contact Cornerstone.IT to help mitigate this vulnerability.