{"api_version":"1","generated_at":"2026-04-23T07:00:05+00:00","cve":"CVE-2021-46837","urls":{"html":"https://cve.report/CVE-2021-46837","api":"https://cve.report/api/cve/CVE-2021-46837.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-46837","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-46837"},"summary":{"title":"CVE-2021-46837","description":"res_pjsip_t38 in Sangoma Asterisk 16.x before 16.16.2, 17.x before 17.9.3, and 18.x before 18.2.2, and Certified Asterisk before 16.8-cert7, allows an attacker to trigger a crash by sending an m=image line and zero port in a response to a T.38 re-invite initiated by Asterisk. This is a re-occurrence of the CVE-2019-15297 symptoms but not for exactly the same reason. 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