The Client Interfaces component in IBM DB2 8.2 before FP18, 9.1 before FP8, 9.5 before FP5, and 9.7 before FP1 does not validate an unspecified pointer, which allows attackers to overwrite "external memory" via unknown vectors, related to a missing "check for null pointers."
http://www.vupen.com/english/advisories/2009/3520
http://www.securityfocus.com/bid/37332
http://www-01.ibm.com/support/docview.wss?uid=swg21412902
http://www-01.ibm.com/support/docview.wss?uid=swg21293566
http://www-01.ibm.com/support/docview.wss?uid=swg1LI74504