{"id":"CVE-2016-6366","url":"https://www.cyber-defence.io/tools/cve/CVE-2016-6366","generatedAt":"2026-10-31T21:09:47.044Z","title":"Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability","description":"Buffer overflow in Cisco Adaptive Security Appliance (ASA) Software through 9.4.2.3 on ASA 5500, ASA 5500-X, ASA Services Module, ASA 1000V, ASAv, Firepower 9300 ASA Security Module, PIX, and FWSM devices allows remote authenticated users to execute arbitrary code via crafted IPv4 SNMP packets, aka Bug ID CSCva92151 or EXTRABACON.","published":"2016-08-18T18:59:00.000Z","lastModified":"2026-06-17T00:50:54.000Z","status":"Analyzed","sourceIdentifier":"psirt@cisco.com","cvss":{"version":"3.1","score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-120"],"affected":["cisco/pix firewall software","cisco/adaptive security appliance software","cisco/asa 1000v cloud firewall software"],"epss":{"score":0.87565,"percentile":0.99758,"date":"2026-10-30","history":[]},"kev":{"listed":true,"dateAdded":"2022-05-24","dueDate":"2022-06-14","knownRansomwareCampaignUse":"Unknown","notes":"Apply updates per vendor instructions.\nhttps://nvd.nist.gov/vuln/detail/CVE-2016-6366"},"exploits":{"count":1,"verified":false,"firstPublished":"2016-08-18","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":40258,"kind":"exploit","title":"Cisco ASA 8.x - 'EXTRABACON' Authentication Bypass","url":"https://www.exploit-db.com/exploits/40258","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/hardware/remote/40258.txt","file":"exploits/hardware/remote/40258.txt","published":"2016-08-18","added":"2016-08-18","updated":"2016-09-15","author":"Shadow Brokers","type":"remote","platform":"hardware","port":161,"verified":false,"codes":["CVE-2016-6366"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 14 June 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[],"references":[{"url":"http://blogs.cisco.com/security/shadow-brokers","tags":["Exploit","Press/Media Coverage","Vendor Advisory"],"source":"psirt@cisco.com"},{"url":"http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-snmp","tags":["Vendor Advisory"],"source":"psirt@cisco.com"},{"url":"http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-56516","tags":["Vendor Advisory"],"source":"psirt@cisco.com"},{"url":"http://www.securityfocus.com/bid/92521","tags":["Broken Link","Not Applicable","Third Party Advisory","VDB Entry"],"source":"psirt@cisco.com"},{"url":"http://www.securitytracker.com/id/1036637","tags":["Broken Link","Third Party Advisory","VDB Entry"],"source":"psirt@cisco.com"},{"url":"https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/40258.zip","tags":["Broken Link","Exploit"],"source":"psirt@cisco.com"},{"url":"https://www.exploit-db.com/exploits/40258/","tags":["Third Party Advisory","VDB Entry"],"source":"psirt@cisco.com"},{"url":"https://zerosum0x0.blogspot.com/2016/09/reverse-engineering-cisco-asa-for.html","tags":["Exploit","Technical Description"],"source":"psirt@cisco.com"},{"url":"http://blogs.cisco.com/security/shadow-brokers","tags":["Exploit","Press/Media Coverage","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160817-asa-snmp","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-56516","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/92521","tags":["Broken Link","Not Applicable","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1036637","tags":["Broken Link","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/40258.zip","tags":["Broken Link","Exploit"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.exploit-db.com/exploits/40258/","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://zerosum0x0.blogspot.com/2016/09/reverse-engineering-cisco-asa-for.html","tags":["Exploit","Technical Description"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-6366","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2016-6366","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."}