The instant message service in Timbuktu Pro 8.6.5 RC 229 and earlier for Windows allows remote attackers to cause (1) a denial of service (daemon crash) via an invalid Version field or (2) a denial of service (CPU consumption and daemon termination) via an invalid or partial message.

More... (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-1337)