{"id":"CVE-2019-18976","url":"https://www.cyber-defence.io/tools/cve/CVE-2019-18976","generatedAt":"2026-11-05T02:30:36.309Z","title":"If it receives a re-invite initiating T.38 faxing and has a port of 0 and no c line in the SDP, a NULL pointer dereference and crash will occur.","description":"An issue was discovered in res_pjsip_t38.c in Sangoma Asterisk through 13.x and Certified Asterisk through 13.21-x. If it receives a re-invite initiating T.38 faxing and has a port of 0 and no c line in the SDP, a NULL pointer dereference and crash will occur. This is different from CVE-2019-18940.","published":"2019-11-22T17:15:12.000Z","lastModified":"2026-06-17T02:25:39.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-476"],"affected":["digium/asterisk","digium/certified asterisk","debian/debian linux"],"epss":{"score":0.12789,"percentile":0.96287,"date":"2026-11-03","history":[{"date":"2026-09-28","score":0.12789,"percentile":0.96152}]},"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 12.8%, higher than 96% of all known CVEs. Patch or mitigate before the next change window."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-09-28T00:00:00.000Z","detail":{"to":0.12789,"from":0.06677,"percentile":0.96152},"summary":"EPSS moved from 6.7% to 12.8% probability of exploitation in the next thirty days."}],"references":[{"url":"http://downloads.asterisk.org/pub/security/AST-2019-008.html","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html","tags":["Mailing List","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://packetstormsecurity.com/files/155436/Asterisk-Project-Security-Advisory-AST-2019-008.html","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"https://seclists.org/fulldisclosure/2019/Nov/20","tags":["Mailing List","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.asterisk.org/downloads/security-advisories","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://www.cybersecurity-help.cz/vdb/SB2019112218?affChecked=1","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://downloads.asterisk.org/pub/security/AST-2019-008.html","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://packetstormsecurity.com/files/155436/Asterisk-Project-Security-Advisory-AST-2019-008.html","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://seclists.org/fulldisclosure/2019/Nov/20","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.asterisk.org/downloads/security-advisories","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cybersecurity-help.cz/vdb/SB2019112218?affChecked=1","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-18976","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."}