Ipswitch Collaboration Suite 2006.02 and below suffers from a vulnerability in the IMAP daemon. A lack of bounds checking during the parsing of long arguments to the FETCH verb can result in an exploitable buffer overflow.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/44619/ZDI-06-003.txt
Source: https://packetstormsecurity.com/files/44619/Zero-Day-Initiative-Advisory-06-03.html