CVE-2021-26717

{"containers": {"cna": {"affected": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "descriptions": [{"lang": "en", "value": "An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38, if the initial remote response was delayed just enough, Asterisk would send both audio and T.38 in the SDP. If this happened, and the remote responded with a declined T.38 stream, then Asterisk would crash."}], "problemTypes": [{"descriptions": [{"description": "n/a", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2021-02-19T15:06:09.000Z", "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://downloads.asterisk.org/pub/security/"}, {"name": "20210218 AST-2021-002: Remote crash possible when negotiating T.38", "tags": ["mailing-list", "x_refsource_FULLDISC"], "url": "http://seclists.org/fulldisclosure/2021/Feb/58"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://downloads.asterisk.org/pub/security/AST-2021-002.html"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://issues.asterisk.org/jira/browse/ASTERISK-29203"}, {"tags": ["x_refsource_MISC"], "url": "http://packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-2021-002.html"}], "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "cve@mitre.org", "ID": "CVE-2021-26717", "STATE": "PUBLIC"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "n/a", "version": {"version_data": [{"version_value": "n/a"}]}}]}, "vendor_name": "n/a"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38, if the initial remote response was delayed just enough, Asterisk would send both audio and T.38 in the SDP. If this happened, and the remote responded with a declined T.38 stream, then Asterisk would crash."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "n/a"}]}]}, "references": {"reference_data": [{"name": "https://downloads.asterisk.org/pub/security/", "refsource": "MISC", "url": "https://downloads.asterisk.org/pub/security/"}, {"name": "20210218 AST-2021-002: Remote crash possible when negotiating T.38", "refsource": "FULLDISC", "url": "http://seclists.org/fulldisclosure/2021/Feb/58"}, {"name": "https://downloads.asterisk.org/pub/security/AST-2021-002.html", "refsource": "CONFIRM", "url": "https://downloads.asterisk.org/pub/security/AST-2021-002.html"}, {"name": "https://issues.asterisk.org/jira/browse/ASTERISK-29203", "refsource": "CONFIRM", "url": "https://issues.asterisk.org/jira/browse/ASTERISK-29203"}, {"name": "http://packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-2021-002.html", "refsource": "MISC", "url": "http://packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-2021-002.html"}]}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T20:33:40.586Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://downloads.asterisk.org/pub/security/"}, {"name": "20210218 AST-2021-002: Remote crash possible when negotiating T.38", "tags": ["mailing-list", "x_refsource_FULLDISC", "x_transferred"], "url": "http://seclists.org/fulldisclosure/2021/Feb/58"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://downloads.asterisk.org/pub/security/AST-2021-002.html"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://issues.asterisk.org/jira/browse/ASTERISK-29203"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "http://packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-2021-002.html"}]}]}, "cveMetadata": {"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "cveId": "CVE-2021-26717", "datePublished": "2021-02-18T19:39:46.000Z", "dateReserved": "2021-02-05T00:00:00.000Z", "dateUpdated": "2024-08-03T20:33:40.586Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*", "matchCriteriaId": "7382B641-0396-456F-BF33-3F6412E35F2D", "versionEndExcluding": "16.16.1", "versionStartIncluding": "16.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*", "matchCriteriaId": "C5BA8606-ADA9-4841-A7E2-A9165138849A", "versionEndExcluding": "17.9.2", "versionStartIncluding": "17.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*", "matchCriteriaId": "F10CB148-DF9C-4134-A417-3B111C036E20", "versionEndExcluding": "18.2.1", "versionStartIncluding": "18.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:-:*:*:*:*:*:*", "matchCriteriaId": "81C3E390-8B99-4EB8-82DD-02893611209A", "vulnerable": true}, {"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc1:*:*:*:*:*:*", "matchCriteriaId": "17DB2297-1908-4F87-8046-2BAA74569D71", "vulnerable": true}, {"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc2:*:*:*:*:*:*", "matchCriteriaId": "CEA2CC40-C2F6-4828-82F0-1B50D3E61F77", "vulnerable": true}, {"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc3:*:*:*:*:*:*", "matchCriteriaId": "32F19F43-C1E8-4B6C-9356-AF355B7320BD", "vulnerable": true}, {"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc4:*:*:*:*:*:*", "matchCriteriaId": "21D1FA32-B441-485F-8AE9-F3A394626909", "vulnerable": true}, {"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert2:*:*:*:*:*:*", "matchCriteriaId": "F7795CCF-B160-4B4F-9529-1192C11D7FDB", "vulnerable": true}, {"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert3:*:*:*:*:*:*", "matchCriteriaId": "0C5E5D0D-9EB3-40FD-8B7E-E93A95D07AB1", "vulnerable": true}, {"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert4:*:*:*:*:*:*", "matchCriteriaId": "C7DFDA30-DD61-4BBC-AFE4-448BF2A4F303", "vulnerable": true}, {"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc1:*:*:*:*:*:*", "matchCriteriaId": "142F1F89-49AC-4A0B-A273-61F697063A5A", "vulnerable": true}, {"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc2:*:*:*:*:*:*", "matchCriteriaId": "53041795-788C-4914-A2F6-41539ABE0244", "vulnerable": true}, {"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc3:*:*:*:*:*:*", "matchCriteriaId": "FBB98E65-B2D0-49A4-8BF3-12155E3E13C9", "vulnerable": true}, {"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc4:*:*:*:*:*:*", "matchCriteriaId": "769C854C-03CD-40A9-B39B-C0CDCA8252EA", "vulnerable": true}, {"criteria": "cpe:2.3:a:digium:certified_asterisk:16.8:cert5:*:*:*:*:*:*", "matchCriteriaId": "6D86AD6E-4E07-48B0-88D8-E18F277FFE6A", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38, if the initial remote response was delayed just enough, Asterisk would send both audio and T.38 in the SDP. If this happened, and the remote responded with a declined T.38 stream, then Asterisk would crash."}, {"lang": "es", "value": "Se detect\u00f3 un problema en Sangoma Asterisk versiones 16.x anteriores a 16.16.1, versiones 17.x anteriores a 17.9.2 y versiones 18.x anteriores a 18.2.1 y Certified Asterisk versiones anteriores a 16.8-cert6. Al renegociar para T.38, si la respuesta remota inicial se retras\u00f3 lo suficiente, Asterisk enviar\u00eda tanto audio como T.38 en el SDP. Si esto sucediera, y el control remoto respondiera con una transmisi\u00f3n T.38 rechazada, entonces Asterisk podr\u00eda bloquearse"}], "id": "CVE-2021-26717", "lastModified": "2026-06-17T03:43:42.950", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-02-18T20:15:12.667", "references": [{"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "http://packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-2021-002.html"}, {"source": "cve@mitre.org", "tags": ["Mailing List", "Patch", "Third Party Advisory"], "url": "http://seclists.org/fulldisclosure/2021/Feb/58"}, {"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "https://downloads.asterisk.org/pub/security/"}, {"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "https://downloads.asterisk.org/pub/security/AST-2021-002.html"}, {"source": "cve@mitre.org", "tags": ["Issue Tracking", "Patch", "Vendor Advisory"], "url": "https://issues.asterisk.org/jira/browse/ASTERISK-29203"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "http://packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-2021-002.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Patch", "Third Party Advisory"], "url": "http://seclists.org/fulldisclosure/2021/Feb/58"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://downloads.asterisk.org/pub/security/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://downloads.asterisk.org/pub/security/AST-2021-002.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Patch", "Vendor Advisory"], "url": "https://issues.asterisk.org/jira/browse/ASTERISK-29203"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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