CVE-2026-20179

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-20179", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "state": "PUBLISHED", "assignerShortName": "cisco", "dateReserved": "2025-10-08T11:59:15.393Z", "datePublished": "2026-10-21T16:12:29.897Z", "dateUpdated": "2026-10-22T19:11:03.271Z"}, "containers": {"cna": {"title": "Multiple Cisco Products Snort 3 Generic Routing Encapsulation Denial of Service Vulnerabilities", "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 Generic Routing Encapsulation (GRE) Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection.\r\n\r\nThis vulnerability is due to incomplete error checking when Snort 3 parses GRE packets. An attacker could exploit this vulnerability by sending a crafted GRE packet to a targeted device to be parsed by Snort. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to restart unexpectedly, resulting in a DoS condition."}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-misc-dos-6mB22qAK", "name": "cisco-sa-snort3-misc-dos-6mB22qAK"}], "exploits": [{"lang": "en", "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."}], "source": {"advisory": "cisco-sa-snort3-misc-dos-6mB22qAK", "discovery": "EXTERNAL", "defects": ["CSCwu51449"]}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "Wrap-around Error", "type": "cwe", "cweId": "CWE-128"}]}], "affected": [{"vendor": "Cisco", "product": "Cisco Open Source Snort3", "versions": [{"version": "3.12.2.0", "status": "affected"}, {"version": "3.1.2.0", "status": "affected"}, {"version": "3.1.3.0", "status": "affected"}, {"version": "3.1.4.0", "status": 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{"version": "7.2.6", "status": "affected"}, {"version": "7.0.6.2", "status": "affected"}, {"version": "7.4.1.1", "status": "affected"}, {"version": "7.2.7", "status": "affected"}, {"version": "7.2.5.2", "status": "affected"}, {"version": "7.3.1.2", "status": "affected"}, {"version": "7.2.8", "status": "affected"}, {"version": "7.6.0", "status": "affected"}, {"version": "7.4.2", "status": "affected"}, {"version": "7.2.8.1", "status": "affected"}, {"version": "7.0.6.3", "status": "affected"}, {"version": "7.4.2.1", "status": "affected"}, {"version": "7.2.9", "status": "affected"}, {"version": "7.0.7", "status": "affected"}, {"version": "7.7.0", "status": "affected"}, {"version": "7.4.2.2", "status": "affected"}, {"version": "7.2.10", "status": "affected"}, {"version": "7.6.1", "status": "affected"}, {"version": "7.4.2.3", "status": "affected"}, {"version": "7.0.8", "status": "affected"}, {"version": "7.6.2", "status": "affected"}, {"version": "7.7.10", "status": "affected"}, {"version": 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"attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "Cisco", "product": "Cisco Open Source Snort3", "versions": [{"status": "affected", "version": "3.12.2.0"}, {"status": "affected", "version": "3.1.2.0"}, {"status": "affected", "version": "3.1.3.0"}, {"status": "affected", "version": "3.1.4.0"}, {"status": "affected", "version": "3.1.5.0"}, {"status": "affected", "version": "3.1.6.0"}, {"status": "affected", "version": "3.1.7.0"}, {"status": "affected", "version": "3.1.8.0"}, {"status": "affected", "version": "3.1.9.0"}, {"status": "affected", "version": "3.1.10.0"}, {"status": "affected", "version": "3.1.12.0"}, {"status": "affected", "version": "3.1.13.0"}, {"status": "affected", "version": "3.1.14.0"}, {"status": "affected", "version": "3.1.15.0"}, {"status": "affected", "version": "3.1.16.0"}, {"status": "affected", "version": "3.1.17.0"}, {"status": "affected", "version": "3.1.18.0"}, 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that are described in this advisory."}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-misc-dos-6mB22qAK", "name": "cisco-sa-snort3-misc-dos-6mB22qAK"}], "descriptions": [{"lang": "en", "value": "Multiple Cisco products are affected by a vulnerability in the Snort 3 Generic Routing Encapsulation (GRE) Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection.\r\n\r\nThis vulnerability is due to incomplete error checking when Snort 3 parses GRE packets. An attacker could exploit this vulnerability by sending a crafted GRE packet to a targeted device to be parsed by Snort. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to restart unexpectedly, resulting in a DoS condition."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "cwe", "cweId": "CWE-128", "description": "Wrap-around Error"}]}], "providerMetadata": {"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "shortName": "cisco", "dateUpdated": "2026-10-22T19:11:03.271Z"}}}, "cveMetadata": {"cveId": "CVE-2026-20179", "state": "PUBLISHED", "dateUpdated": "2026-10-22T19:11:03.271Z", "dateReserved": "2025-10-08T11:59:15.393Z", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "datePublished": "2026-10-21T16:12:29.897Z", "assignerShortName": "cisco"}, "dataVersion": "5.2"}

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"version": "17.18.1"}, {"status": "affected", "version": "17.18.1a"}, {"status": "affected", "version": "17.12.6"}, {"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": "17.18.3a"}, {"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 Generic Routing Encapsulation (GRE) Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection.\r\n\r\nThis vulnerability is due to incomplete error checking when Snort 3 parses GRE packets. An attacker could exploit this vulnerability by sending a crafted GRE packet to a targeted device to be parsed by Snort. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to restart unexpectedly, resulting in a DoS condition."}], "id": "CVE-2026-20179", "lastModified": "2026-10-22T14:17:40.290", "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-2026-20179", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-21T17:21:03.985190Z", "version": "2.0.3"}}]}, "published": "2026-10-21T17:18:27.340", "references": [{"source": "psirt@cisco.com", "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-misc-dos-6mB22qAK"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-128"}], "source": "psirt@cisco.com", "type": "Secondary"}]}

{}

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