iDefense Security Advisory 05.08.07 – Remote exploitation of an integer overflow vulnerability in the IMAP service of Microsoft Exchange 2000 could allow a remote attacker to crash all running Exchange services and other services in the same process. The vulnerability specifically exists in code responsible for reading of literals in the IMAP4 service. When the IMAP4 service encounters a specially crafted literal, it fails to properly process it. An access violation occurs causing an unhandled exception that terminates the process. iDefense confirmed the existence of this vulnerability in Microsoft Exchange 2000 with Service Pack 3.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/56635/05.08.07-4.txt
Source: https://packetstormsecurity.com/files/56635/iDEFENSE-Security-Advisory-2007-05-08.4.html