Cerulean Studios Trillian 0.73 and earlier use weak encrypttion (XOR) for storing user passwords in .ini files in the Trillian directory, which allows local users to gain access to other user accounts.
Buffer overflow in the XML parser of Trillian 0.6351, 0.725 and 0.73 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a skin with a long colors file name in trillian.xml.
Buffer overflow in the IDENT daemon (identd) in Trillian 0.6351, 0.725, 0.73, 0.74 and 1.0 pro allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a long request.