This indicates an attempt to exploit one of several buffer overflow vulnerabilities in the IBM DB2 Universal Database.
The vulnerabilities are caused by an error that occurs when the software handles a malicious JDBC type 3 packet. As a result a remote attacker may be able to execute arbitrary code by sending a specially crafted packet.
IBM DB2 9.0 and previous versions.
System compromise: arbitrary code execution.
Apply patch, available from the web site.