Security News > 2022 > January > Microsoft releases emergency fix for Exchange year 2022 bug
Microsoft has released an emergency fix for a year 2022 bug that is breaking email delivery on on-premise Microsoft Exchange servers.
These errors are caused by Microsoft Exchange checking the version of the FIP-FS antivirus scanning engine and attempting to store the date in a signed int32 variable.
Due to this, when Microsoft Exchange attempts to check the AV scanning version, it would generate a bug and cause the malware engine to crash.
Microsoft has released a temporary fix requiring customer action while working on an update that automatically fixes the issue.
' When executed, the script will stop the Microsoft Filtering Management and Microsoft Exchange Transport services, delete older AV engine files, download the new AV engine, and start the services again.
"The newly updated scanning engine is fully supported by Microsoft. While we need to work on this sequence longer term, the scanning engine version was not rolled back, rather it was rolled forward into this new sequence," explained Microsoft.