{"api_version":"1","generated_at":"2026-10-23T18:11:52+00:00","cve":"CVE-2026-20197","urls":{"html":"https://cve.report/CVE-2026-20197","api":"https://cve.report/api/cve/CVE-2026-20197.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-20197","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-20197"},"summary":{"title":"Multiple Cisco Products Snort 3 Teredo Protocol Denial of Service Vulnerability","description":"Multiple Cisco products are affected by a vulnerability in the Snort 3 Teredo 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 Teredo packets. An attacker could exploit this vulnerability by sending a crafted Teredo 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.","state":"PUBLISHED","assigner":"cisco","published_at":"2026-10-21 17:18:27","updated_at":"2026-10-22 14:17:40"},"problem_types":["CWE-119","CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer"],"metrics":[{"version":"3.1","source":"psirt@cisco.com","type":"Secondary","score":"5.8","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","data":{"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"}},{"version":"3.1","source":"CNA","type":"CVSSV3_1","score":"5.8","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L","data":{"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"}}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-misc-dos-6mB22qAK","name":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-misc-dos-6mB22qAK","refsource":"psirt@cisco.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-20197","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20197","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Cisco","product":"Cisco Open Source Snort3","version":"affected 3.12.2.0","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Open Source Snort3","version":"affected 3.1.2.0","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Open Source Snort3","version":"affected 3.1.3.0","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Open Source Snort3","version":"affected 3.1.4.0","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Open Source Snort3","version":"affected 3.1.5.0","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Open Source Snort3","version":"affected 3.1.6.0","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Open Source Snort3","version":"affected 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