The DRDA Services component in IBM DB2 9.1 before FP7 and 9.5 before FP4 allows remote attackers to cause a denial of service (memory corruption and application crash) via an IPv6 address in the correlation token in the APPID string, as demonstrated by an APPID string sent by the third-party DataDirect JDBC driver 3.7.32.
http://www.securityfocus.com/bid/35171