CVE-2026-20011

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-20011", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "state": "PUBLISHED", "assignerShortName": "cisco", "dateReserved": "2025-10-08T11:59:15.350Z", "datePublished": "2026-10-21T16:12:19.429Z", "dateUpdated": "2026-10-22T19:11:17.797Z"}, "containers": {"cna": {"title": "Multiple Cisco Products Snort 3 SMTP MIME Denial of Service Vulnerability", "metrics": [{"format": "cvssV3_1", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L", "baseScore": 5.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}}], "descriptions": [{"lang": "en", "value": "Multiple Cisco products are affected by a vulnerability in the Snort 3 SMTP MIME Decoder that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.\r\n\r\nThis vulnerability is due to a lack of error checking when the MIME fields of the SMTP header are parsed. An attacker could exploit this vulnerability by sending crafted SMTP packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts."}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-mime-vulns-bkXjcKkt", "name": "cisco-sa-snort3-mime-vulns-bkXjcKkt"}], "exploits": [{"lang": "en", "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."}], "source": {"advisory": "cisco-sa-snort3-mime-vulns-bkXjcKkt", "discovery": "INTERNAL", "defects": ["CSCws62055"]}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "Buffer Access with Incorrect Length Value", "type": "cwe", "cweId": "CWE-805"}]}], "affected": [{"vendor": "Cisco", "product": "Cisco Open Source Snort3", "versions": [{"version": "3.1.2.0", "status": "affected"}, {"version": "3.1.3.0", "status": "affected"}, {"version": "3.1.4.0", "status": "affected"}, 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"134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-22T13:37:56.428Z"}}]}}

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{"status": "affected", "version": "17.18.1a"}, {"status": "affected", "version": "17.12.6"}, {"status": "affected", "version": "17.9.8"}, {"status": "affected", "version": "17.15.4c"}, {"status": "affected", "version": "17.12.5d"}, {"status": "affected", "version": "17.18.2"}, {"status": "affected", "version": "26.1.1"}, {"status": "affected", "version": "17.15.5"}, {"status": "affected", "version": "17.15.5a"}, {"status": "affected", "version": "17.12.7"}, {"status": "affected", "version": "17.12.7a"}, {"status": "affected", "version": "17.12.7b"}, {"status": "affected", "version": "17.9.9"}, {"status": "affected", "version": "17.12.8"}, {"status": "affected", "version": "17.15.6"}, {"status": "affected", "version": "17.18.4"}, {"status": "affected", "version": "26.1.2"}], "defaultStatus": "unknown"}], "exploits": [{"lang": "en", "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-mime-vulns-bkXjcKkt", "name": "cisco-sa-snort3-mime-vulns-bkXjcKkt"}], "descriptions": [{"lang": "en", "value": "Multiple Cisco products are affected by a vulnerability in the Snort 3 SMTP MIME Decoder that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.\r\n\r\nThis vulnerability is due to a lack of error checking when the MIME fields of the SMTP header are parsed. An attacker could exploit this vulnerability by sending crafted SMTP packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "cwe", "cweId": "CWE-805", "description": "Buffer Access with Incorrect Length Value"}]}], "providerMetadata": {"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "shortName": "cisco", "dateUpdated": "2026-10-22T19:11:17.797Z"}}}, "cveMetadata": {"cveId": "CVE-2026-20011", "state": "PUBLISHED", "dateUpdated": "2026-10-22T19:11:17.797Z", "dateReserved": "2025-10-08T11:59:15.350Z", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "datePublished": "2026-10-21T16:12:19.429Z", "assignerShortName": "cisco"}, "dataVersion": "5.2"}

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"version": "17.12.6"}, {"status": "affected", "version": "17.9.8"}, {"status": "affected", "version": "17.15.4c"}, {"status": "affected", "version": "17.12.5d"}, {"status": "affected", "version": "17.18.2"}, {"status": "affected", "version": "26.1.1"}, {"status": "affected", "version": "17.15.5"}, {"status": "affected", "version": "17.15.5a"}, {"status": "affected", "version": "17.12.7"}, {"status": "affected", "version": "17.12.7a"}, {"status": "affected", "version": "17.12.7b"}, {"status": "affected", "version": "17.9.9"}, {"status": "affected", "version": "17.12.8"}, {"status": "affected", "version": "17.15.6"}, {"status": "affected", "version": "17.18.4"}, {"status": "affected", "version": "26.1.2"}]}], "source": "psirt@cisco.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Multiple Cisco products are affected by a vulnerability in the Snort 3 SMTP MIME Decoder that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart.\r\n\r\nThis vulnerability is due to a lack of error checking when the MIME fields of the SMTP header are parsed. An attacker could exploit this vulnerability by sending crafted SMTP packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a denial of service (DoS) condition when the Snort 3 Detection Engine unexpectedly restarts."}], "id": "CVE-2026-20011", "lastModified": "2026-10-22T14:17:39.607", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "psirt@cisco.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-20011", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-21T17:21:13.598133Z", "version": "2.0.3"}}]}, "published": "2026-10-21T17:18:26.640", "references": [{"source": "psirt@cisco.com", "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-mime-vulns-bkXjcKkt"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-805"}], "source": "psirt@cisco.com", "type": "Secondary"}]}

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