Multiple stack-based buffer overflows in ovalarmsrv in HP OpenView Network Node Manager (OV NNM) 7.51, and possibly 7.01, 7.50, and 7.53, allow remote attackers to execute arbitrary code via a long (1) REQUEST_SEV_CHANGE (aka number 47), (2) REQUEST_SAVE_STATE (aka number 61), or (3) REQUEST_RESTORE_STATE (aka number 62) request to TCP port 2954.