CVE & CISA-KEV CatalogNVD
CVE-2016-6603
CRITICALEPSS 100th pctl9.8
CVSS v3
Description
ZOHO WebNMS Framework 5.2 and 5.2 SP1 allows remote attackers to bypass authentication and impersonate arbitrary users via the UserName HTTP header.
CVSS v3 Vector
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
86.93%probability of exploitation in 30 days
100thpercentile
Very high risk: more likely to be exploited than 100% of all known CVEs.
References
- http://packetstormsecurity.com/files/138244/WebNMS-Framework-5.2-SP1-Traversal-Weak-Obfuscation-User-Impersonation.html
- http://seclists.org/fulldisclosure/2016/Aug/54
- http://www.securityfocus.com/archive/1/539159/100/0/threaded
- http://www.securityfocus.com/bid/92402
- https://blogs.securiteam.com/index.php/archives/2712
- https://forums.webnms.com/topic/recent-vulnerabilities-in-webnms-and-how-to-protect-the-server-against-them
- https://github.com/pedrib/PoC/blob/master/advisories/webnms-5.2-sp1-pwn.txt
- https://www.exploit-db.com/exploits/40229/
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Start freeThis product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.