Buffer overflow in the TCP/IP listener in IBM DB2 Universal Database (UDB) before 8.1 FixPak 12 allows remote attackers to cause a denial of service (application crash) via a long MGRLVLLS message inside of an EXCSAT message when establishing a connection.
IBM DB2 Universal Database version 6.1 creates an account with a default user name and password, which allows remote attackers to gain access to the database.