As the year 2022 rolled in and the clock struck midnight, Exchange admins worldwide discovered that their servers were no longer delivering email. After investigating, they found that mail was getting stuck in the queue, and the Windows event log showed one of the following errors.
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.
However, this variable can store only a maximum value of 2,201,010,001, which is less than the new date value of 2,201,010,001 for January 1st, 2022, at midnight.
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.