Multiple heap-based buffer overflows in OvCgi/Toolbar.exe in HP OpenView Network Node Manager (OV NNM) 7.01 7.51 and 7.53 allow remote attackers to execute arbitrary code via (1) a long OvAcceptLang cookie which triggers the error in ov.dll and ovwww.dll or (2) a long Accept-Language HTTP header which triggers the error in ovwww.dll or libovwww.so.4.