Multiple buffer overflows in Computer Associates (CA) BrightStor ARCserve Backup R11.5 Server before SP2 allows remote attackers to execute arbitrary code in the Tape Engine (tapeeng.exe) via a crafted RPC request with (1) opnum 38, which is not properly handled in TAPEUTIL.dll 11.5.3884.0, or (2) opnum 37, which is not properly handled in TAPEENG.dll 11.5.3884.0.