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        "cveId": "CVE-2023-49786",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2023-11-30T13:39:50.862Z",
        "datePublished": "2023-12-14T19:47:46.306Z",
        "dateUpdated": "2024-10-08T14:20:19.222Z"
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    "containers": {
        "cna": {
            "title": "Asterisk susceptible to Denial of Service via DTLS Hello packets during call initiation",
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                            "cweId": "CWE-703",
                            "lang": "en",
                            "description": "CWE-703: Improper Check or Handling of Exceptional Conditions",
                            "type": "CWE"
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                    ]
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                {
                    "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"
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            ],
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                {
                    "name": "https://github.com/asterisk/asterisk/security/advisories/GHSA-hxj9-xwr8-w8pq",
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                    "name": "https://github.com/asterisk/asterisk/commit/d7d7764cb07c8a1872804321302ef93bf62cba05",
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                    "name": "https://github.com/EnableSecurity/advisories/tree/master/ES2023-01-asterisk-dtls-hello-race",
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                    "url": "http://www.openwall.com/lists/oss-security/2023/12/15/7"
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                    "url": "http://packetstormsecurity.com/files/176251/Asterisk-20.1.0-Denial-Of-Service.html"
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                    "url": "http://seclists.org/fulldisclosure/2023/Dec/24"
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                            "version": "< 18.20.1",
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                        {
                            "version": ">= 19.0.0, < 20.5.1",
                            "status": "affected"
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                        {
                            "version": "= 21.0.0",
                            "status": "affected"
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                        {
                            "version": "< 18.9-cert6",
                            "status": "affected"
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            "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."
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                                "timestamp": "2024-10-08T14:19:55.907894Z",
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