{"id":"CVE-2016-6909","url":"https://www.cyber-defence.io/tools/cve/CVE-2016-6909","generatedAt":"2026-10-28T20:05:49.658Z","title":"Buffer overflow in the Cookie parser in Fortinet FortiOS 4.x before 4.1.11, 4.2.x before 4.2.13, and 4.3.x before 4.3.9 and FortiSwitch before 3.4.3 allows remote attackers to execute arbitrary code via a crafted HTTP request, aka EGREGIOUSBLUNDER.","description":"Buffer overflow in the Cookie parser in Fortinet FortiOS 4.x before 4.1.11, 4.2.x before 4.2.13, and 4.3.x before 4.3.9 and FortiSwitch before 3.4.3 allows remote attackers to execute arbitrary code via a crafted HTTP request, aka EGREGIOUSBLUNDER.","published":"2016-08-24T16:30:00.000Z","lastModified":"2026-06-17T00:51:59.000Z","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-119"],"affected":["fortinet/fortios","fortinet/fortiswitch"],"epss":{"score":0.49856,"percentile":0.98892,"date":"2026-10-27","history":[{"date":"2026-09-21","score":0.36151,"percentile":0.98451},{"date":"2026-09-22","score":0.49856,"percentile":0.98845}]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2016-08-19","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":40276,"kind":"exploit","title":"Fortigate Firewalls - 'EGREGIOUSBLUNDER' Remote Code Execution","url":"https://www.exploit-db.com/exploits/40276","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/hardware/webapps/40276.txt","file":"exploits/hardware/webapps/40276.txt","published":"2016-08-19","added":"2016-08-19","updated":"2016-09-15","author":"Shadow Brokers","type":"webapps","platform":"hardware","port":null,"verified":false,"codes":["CVE-2016-6909"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 49.9%, higher than 99% 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":0.49856,"from":0.36151,"percentile":0.98845},"summary":"EPSS moved from 36.2% to 49.9% probability of exploitation in the next thirty days."}],"references":[{"url":"http://fortiguard.com/advisory/FG-IR-16-023","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://packetstormsecurity.com/files/138387/EGREGIOUSBLUNDER-Fortigate-Remote-Code-Execution.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/bid/92523","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id/1036643","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"https://musalbas.com/2016/08/16/equation-group-firewall-operations-catalogue.html","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.exploit-db.com/exploits/40276/","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"http://fortiguard.com/advisory/FG-IR-16-023","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://packetstormsecurity.com/files/138387/EGREGIOUSBLUNDER-Fortigate-Remote-Code-Execution.html","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/92523","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1036643","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://musalbas.com/2016/08/16/equation-group-firewall-operations-catalogue.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.exploit-db.com/exploits/40276/","tags":["Exploit","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2016-6909","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."}