Stack-based buffer overflow in the client acceptor daemon (CAD) scheduler in the client in IBM Tivoli Storage Manager (TSM) 5.3 before 5.3.6.7, 5.4 before 5.4.3, 5.5 before 5.5.2.2, and 6.1 before 6.1.0.2, and TSM Express 5.3.3.0 through 5.3.6.6, allows remote attackers to execute arbitrary code via crafted data in a TCP packet.