{"id":"CVE-2023-49786","state":"PUBLISHED","title":"Asterisk susceptible to Denial of Service via DTLS Hello packets during call initiation","description":"Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk prior to versions 18.20.1, 20.5.1, and 21.0.1; as well as certified-asterisk prior to 18.9-cert6; Asterisk is susceptible to a DoS due to a race condition in the hello handshake phase of the DTLS protocol when handling DTLS-SRTP for media setup. This attack can be done continuously, thus denying new DTLS-SRTP encrypted calls during the attack. Abuse of this vulnerability may lead to a massive Denial of Service on vulnerable Asterisk servers for calls that rely on DTLS-SRTP. Commit d7d7764cb07c8a1872804321302ef93bf62cba05 contains a fix, which is part of versions 18.20.1, 20.5.1, 21.0.1, amd 18.9-cert6.","publishedAt":"2023-12-14T19:47:46.306Z","updatedAt":"2025-02-13T17:18:55.224Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["asterisk asterisk"],"affected":[{"vendor":"asterisk","product":"asterisk","versions":[{"version":"< 18.20.1","status":"affected"},{"version":">= 19.0.0, < 20.5.1","status":"affected"},{"version":"= 21.0.0","status":"affected"},{"version":"< 18.9-cert6","status":"affected"}]}],"references":["https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq","https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05","https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race","http://www.openwall.com/lists/oss-security/2023/12/15/7","http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html","http://seclists.org/fulldisclosure/2023/Dec/24","https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html"],"weaknesses":["CWE-703"],"ingestedAt":"2026-10-29T20:06:24.729Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/49xxx/CVE-2023-49786.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2023-49786","state":"PUBLISHED","datePublished":"2023-12-14T19:47:46.306Z","dateUpdated":"2025-02-13T17:18:55.224Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2023-11-30T13:39:50.862Z"},"containers":{"cna":{"title":"Asterisk susceptible to Denial of Service via DTLS Hello packets during call initiation","descriptions":[{"lang":"en","value":"Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk prior to versions 18.20.1, 20.5.1, and 21.0.1; as well as certified-asterisk prior to 18.9-cert6; Asterisk is susceptible to a DoS due to a race condition in the hello handshake phase of the DTLS protocol when handling DTLS-SRTP for media setup. This attack can be done continuously, thus denying new DTLS-SRTP encrypted calls during the attack. Abuse of this vulnerability may lead to a massive Denial of Service on vulnerable Asterisk servers for calls that rely on DTLS-SRTP. Commit d7d7764cb07c8a1872804321302ef93bf62cba05 contains a fix, which is part of versions 18.20.1, 20.5.1, 21.0.1, amd 18.9-cert6."}],"affected":[{"vendor":"asterisk","product":"asterisk","versions":[{"version":"< 18.20.1","status":"affected"},{"version":">= 19.0.0, < 20.5.1","status":"affected"},{"version":"= 21.0.0","status":"affected"},{"version":"< 18.9-cert6","status":"affected"}]}],"references":[{"url":"https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq","name":"https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05","name":"https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05","tags":["x_refsource_MISC"]},{"url":"https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race","name":"https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race","tags":["x_refsource_MISC"]},{"url":"http://www.openwall.com/lists/oss-security/2023/12/15/7"},{"url":"http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html"},{"url":"http://seclists.org/fulldisclosure/2023/Dec/24"},{"url":"https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html"}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-703","lang":"en","description":"CWE-703: Improper Check or Handling of Exceptional Conditions","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2023-12-29T00:06:18.647Z"},"source":{"advisory":"GHSA-hxj9-xwr8-w8pq","discovery":"UNKNOWN"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq","name":"https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq","tags":["x_refsource_CONFIRM","x_transferred"]},{"url":"https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05","name":"https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race","name":"https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race","tags":["x_refsource_MISC","x_transferred"]},{"url":"http://www.openwall.com/lists/oss-security/2023/12/15/7","tags":["x_transferred"]},{"url":"http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html","tags":["x_transferred"]},{"url":"http://seclists.org/fulldisclosure/2023/Dec/24","tags":["x_transferred"]},{"url":"https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-02T22:01:25.997Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-10-08T14:19:55.907894Z","id":"CVE-2023-49786","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-10-08T14:20:19.222Z"}}]}}}