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.