Multiple stack-based buffer overflows in HP OpenView Network Node Manager (OV NNM) 6.41, 7.01, and 7.51 allow remote attackers to execute arbitrary code via unspecified long arguments to (1) ovlogin.exe, (2) OpenView5.exe, (3) snmpviewer.exe, and (4) webappmon.exe, as demonstrated via a long Action parameter to OpenView5.exe.