{"id":"CVE-2017-17850","url":"https://www.cyber-defence.io/tools/cve/CVE-2017-17850","generatedAt":"2026-10-28T20:48:29.702Z","title":"For those messages, if the header was not present and the PJSIP channel driver was used, Asterisk would crash.","description":"An issue was discovered in Asterisk 13.18.4 and older, 14.7.4 and older, 15.1.4 and older, and 13.18-cert1 and older. A select set of SIP messages create a dialog in Asterisk. Those SIP messages must contain a contact header. For those messages, if the header was not present and the PJSIP channel driver was used, Asterisk would crash. The severity of this vulnerability is somewhat mitigated if authentication is enabled. If authentication is enabled, a user would have to first be authorized before reaching the crash point.","published":"2017-12-27T17:08:20.000Z","lastModified":"2026-06-17T01:11:46.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":7.5,"severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-20"],"affected":["digium/asterisk","digium/certified asterisk"],"epss":{"score":0.75351,"percentile":0.99511,"date":"2026-10-27","history":[{"date":"2026-09-21","score":0.65833,"percentile":0.99262},{"date":"2026-09-22","score":0.75351,"percentile":0.99492}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 75.4%, 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":0.75351,"from":0.65833,"percentile":0.99492},"summary":"EPSS moved from 65.8% to 75.4% probability of exploitation in the next thirty days."}],"references":[{"url":"http://downloads.asterisk.org/pub/security/AST-2017-014.html","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id/1040056","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"https://issues.asterisk.org/jira/browse/ASTERISK-27480","tags":["Issue Tracking","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://security.gentoo.org/glsa/201811-11","source":"cve@mitre.org"},{"url":"http://downloads.asterisk.org/pub/security/AST-2017-014.html","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1040056","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://issues.asterisk.org/jira/browse/ASTERISK-27480","tags":["Issue Tracking","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/201811-11","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2017-17850","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."}