Heap-based buffer overflow in OvWebHelp.exe in HP OpenView Network Node Manager (OV NNM) 7.01, 7.51, and 7.53 allows remote attackers to execute arbitrary code via a long Topic parameter.
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Score elevated to 9.0 because EPSS predicts 86% probability of exploitation within the next 30 days (top 0.6% of all CVEs). Confidence: see factors.
Heap-based buffer overflow in OvWebHelp.exe in HP OpenView Network Node Manager (OV NNM) 7.01, 7.51, and 7.53 allows remote attackers to execute arbitrary code via a long Topic parameter.
December 10, 2009
April 23, 2026
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
Working exploit code is in the public domain (1 Metasploit module) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
HP OpenView Network Node Manager (OV NNM) - 'OvWebHelp.exe' CGI Buffer Overflow (Metasploit)
Open source ↗HP OpenView Network Node Manager (OV NNM) - 'OvWebHelp.exe' CGI Topic Overflow
Open source ↗HP OpenView Network Node Manager OvWebHelp.exe CGI Buffer Overflow
Open source ↗Explore the affected products and dependency analysis for CVE-2009-4178
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CWE-119