IBM DB2 UDB 8.2 before Fixpak 7 (aka fixpack 14), and DB2 9 before Fix Pack 2, on UNIX allows the "fenced" user to access certain unauthorized directories.
IBM DB2 Universal Database (UDB) before 8.1 FixPak 13 allows remote authenticated users to cause a denial of service (crash) by (1) sending the first ACCSEC command without an RDBNAM parameter during the CONNECT process, or (2) sending crafted SQLJRA packet, which results in a null dereference.