The DRDA Services component in IBM DB2 UDB 9.5 before FP6a allows remote authenticated users to cause a denial of service (database server ABEND) by using the client CLI on Linux, UNIX, or Windows for executing a prepared statement with a large number of parameter markers.

The "Query Compiler, Rewrite, Optimizer" component in IBM DB2 UDB 9.5 before FP6a allows remote authenticated users to cause a denial of service (CPU consumption) via a crafted query involving certain UNION ALL views, leading to an indefinitely large amount of compilation time.

Memory leak in the Relational Data Services component in IBM DB2 UDB 9.5 before FP6a allows remote authenticated users to cause a denial of service (heap memory consumption) by executing a (1) user-defined function (UDF) or (2) stored procedure while using a different code page than the database server.

The Common Code Infrastructure component in IBM DB2 8 before FP17, 9.1 before FP7, and 9.5 before FP4, when LDAP security (aka IBMLDAPauthserver) and anonymous bind are enabled, allows remote attackers to bypass password authentication and establish a database connection via unspecified vectors.