{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-06-17T00:47:33.931","vulnerabilities":[{"cve":{"id":"CVE-2021-26906","sourceIdentifier":"cve@mitre.org","published":"2021-02-18T20:15:12.743","lastModified":"2024-11-21T05:57:00.817","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"An issue was discovered in res_pjsip_session.c in Digium Asterisk through 13.38.1; 14.x, 15.x, and 16.x through 16.16.0; 17.x through 17.9.1; and 18.x through 18.2.0, and Certified Asterisk through 16.8-cert5. An SDP negotiation vulnerability in PJSIP allows a remote server to potentially crash Asterisk by sending specific SIP responses that cause an SDP negotiation failure."},{"lang":"es","value":"Se detectó un problema en el archivo res_pjsip_session.c en Digium Asterisk versiones hasta 13.38.1; 14.x, 15.x y 16.xa 16.16.0; 17.xa 17.9.1; y 18.xa 18.2.0, y Certified Asterisk versiones hasta 16.8-cert5. Una vulnerabilidad de negociación SDP en PJSIP permite a un servidor remoto bloquear potencialmente Asterisk mediante el envío de respuestas SIP específicas que causan un fallo en la negociación SDP"}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":5.9,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.2,"impactScore":3.6}],"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:N/I:N/A:P","baseScore":4.3,"accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL"},"baseSeverity":"MEDIUM","exploitabilityScore":8.6,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-404"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*","versionStartIncluding":"13.0.0","versionEndExcluding":"13.38.2","matchCriteriaId":"37BA1B0D-474E-4F73-A329-F703C928C07D"},{"vulnerable":true,"criteria":"cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*","versionStartIncluding":"16.0.0","versionEndExcluding":"16.16.1","matchCriteriaId":"7382B641-0396-456F-BF33-3F6412E35F2D"},{"vulnerable":true,"criteria":"cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*","versionStartIncluding":"17.0.0","versionEndExcluding":"17.9.2","matchCriteriaId":"C5BA8606-ADA9-4841-A7E2-A9165138849A"},{"vulnerable":true,"criteria":"cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*","versionStartIncluding":"18.0","versionEndExcluding":"18.2.1","matchCriteriaId":"F10CB148-DF9C-4134-A417-3B111C036E20"},{"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"}]}]}],"references":[{"url":"http://packetstormsecurity.com/files/161477/Asterisk-Project-Security-Advisory-AST-2021-005.html","source":"cve@mitre.org","tags":["Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2021/Feb/61","source":"cve@mitre.org","tags":["Mailing List","Patch","Third Party Advisory"]},{"url":"https://downloads.asterisk.org/pub/security/","source":"cve@mitre.org","tags":["Vendor Advisory"]},{"url":"https://downloads.asterisk.org/pub/security/AST-2021-005.html","source":"cve@mitre.org","tags":["Vendor Advisory"]},{"url":"https://issues.asterisk.org/jira/browse/ASTERISK-29196","source":"cve@mitre.org","tags":["Issue Tracking","Patch","Vendor Advisory"]},{"url":"http://packetstormsecurity.com/files/161477/Asterisk-Project-Security-Advisory-AST-2021-005.html","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"]},{"url":"http://seclists.org/fulldisclosure/2021/Feb/61","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Mailing List","Patch","Third Party 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-2021-005.html","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Vendor Advisory"]},{"url":"https://issues.asterisk.org/jira/browse/ASTERISK-29196","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Issue Tracking","Patch","Vendor Advisory"]}]}}]}