{"id":"CVE-2016-6603","url":"https://www.cyber-defence.io/tools/cve/CVE-2016-6603","generatedAt":"2026-11-05T05:07:47.852Z","title":"ZOHO WebNMS Framework 5.2 and 5.2 SP1 allows remote attackers to bypass authentication and impersonate arbitrary users via the UserName HTTP header.","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.","published":"2017-01-23T21:59:02.000Z","lastModified":"2026-06-17T00:51:26.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-20"],"affected":["zohocorp/webnms framework"],"epss":{"score":0.86926,"percentile":0.99747,"date":"2026-11-04","history":[{"date":"2026-09-21","score":0.48798,"percentile":0.98855},{"date":"2026-09-22","score":0.8704,"percentile":0.9974}]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2016-08-10","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":40229,"kind":"exploit","title":"WebNMS Framework Server 5.2/5.2 SP1 - Multiple Vulnerabilities","url":"https://www.exploit-db.com/exploits/40229","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/jsp/webapps/40229.txt","file":"exploits/jsp/webapps/40229.txt","published":"2016-08-10","added":"2016-08-10","updated":"2018-01-25","author":"Pedro Ribeiro","type":"webapps","platform":"jsp","port":null,"verified":false,"codes":["CVE-2016-6603","CVE-2016-6602","CVE-2016-6601","CVE-2016-6600"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":"https://github.com/pedrib/PoC/blob/dc2fe2d4a01ef7ee0cf444b2d435a8cd39cd7069/advisories/webnms-5.2-sp1-pwn.txt"}]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 86.9%, higher than 100% of all known CVEs. Patch or mitigate before the next change window."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-09-22T00:00:00.000Z","detail":{"to":0.8704,"from":0.48798,"percentile":0.9974},"summary":"EPSS moved from 48.8% to 87.0% probability of exploitation in the next thirty days."},{"kind":"epss","label":"EPSS jump","at":"2026-09-21T00:00:00.000Z","detail":{"to":0.48798,"from":0.8704,"percentile":0.98855},"summary":"EPSS moved from 87.0% to 48.8% probability of exploitation in the next thirty days."}],"references":[{"url":"http://packetstormsecurity.com/files/138244/WebNMS-Framework-5.2-SP1-Traversal-Weak-Obfuscation-User-Impersonation.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"http://seclists.org/fulldisclosure/2016/Aug/54","tags":["Exploit","Mailing List","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/archive/1/539159/100/0/threaded","source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/bid/92402","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"https://blogs.securiteam.com/index.php/archives/2712","tags":["Exploit","Technical Description","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://forums.webnms.com/topic/recent-vulnerabilities-in-webnms-and-how-to-protect-the-server-against-them","source":"cve@mitre.org"},{"url":"https://github.com/pedrib/PoC/blob/master/advisories/webnms-5.2-sp1-pwn.txt","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.exploit-db.com/exploits/40229/","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"http://packetstormsecurity.com/files/138244/WebNMS-Framework-5.2-SP1-Traversal-Weak-Obfuscation-User-Impersonation.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://seclists.org/fulldisclosure/2016/Aug/54","tags":["Exploit","Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/archive/1/539159/100/0/threaded","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/92402","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://blogs.securiteam.com/index.php/archives/2712","tags":["Exploit","Technical Description","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://forums.webnms.com/topic/recent-vulnerabilities-in-webnms-and-how-to-protect-the-server-against-them","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/pedrib/PoC/blob/master/advisories/webnms-5.2-sp1-pwn.txt","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.exploit-db.com/exploits/40229/","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2016-6603","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}