{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-20006", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "state": "PUBLISHED", "assignerShortName": "cisco", "dateReserved": "2025-10-08T11:59:15.349Z", "datePublished": "2026-03-04T17:37:54.866Z", "dateUpdated": "2026-03-04T20:51:58.937Z"}, "containers": {"cna": {"title": "Cisco Firepower Threat Defense Software and Cisco FirePOWER Services TLS with Snort 3 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": "A vulnerability in the TLS cryptography functionality of the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to unexpectedly restart, resulting in a denial of service (DoS) condition.\r\n\r\nThis vulnerability is due to improper implementation of the TLS protocol. An attacker could exploit this vulnerability by sending a crafted TLS packet to an affected system. A successful exploit could allow the attacker to cause a device that is running Cisco Secure FTD Software to drop network traffic, resulting in a DoS condition. \r\nNote: TLS 1.3 is not affected by this vulnerability."}], "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tcp-dos-rHfqnwRg", "name": "cisco-sa-ftd-tcp-dos-rHfqnwRg"}], "exploits": [{"lang": "en", "value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."}], "source": {"advisory": "cisco-sa-ftd-tcp-dos-rHfqnwRg", "discovery": "INTERNAL", "defects": ["CSCwn73801"]}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "Error Handling", "type": "cwe", "cweId": "CWE-388"}]}], "affected": [{"vendor": "Cisco", "product": "Cisco Secure Firewall Threat Defense (FTD) Software", "versions": [{"version": "7.2.0", "status": "affected"}, {"version": "7.2.0.1", "status": "affected"}, {"version": "7.2.1", "status": "affected"}, {"version": "7.3.0", "status": "affected"}, {"version": "7.2.2", "status": "affected"}, {"version": "7.2.3", "status": "affected"}, {"version": "7.3.1", "status": "affected"}, {"version": "7.2.4", "status": "affected"}, {"version": "7.2.5", "status": "affected"}, {"version": "7.2.4.1", "status": "affected"}, {"version": "7.3.1.1", "status": "affected"}, {"version": "7.4.0", "status": "affected"}, {"version": "7.2.5.1", "status": "affected"}, {"version": "7.4.1", "status": "affected"}, {"version": "7.2.6", "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": "7.4.2.1", "status": "affected"}, {"version": "7.2.9", "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": "7.6.2", "status": "affected"}, {"version": "7.6.2.1", "status": "affected"}, {"version": "7.4.2.4", "status": "affected"}, {"version": "7.2.10.2", "status": "affected"}], "defaultStatus": "unknown"}], "providerMetadata": {"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "shortName": "cisco", "dateUpdated": "2026-03-04T17:37:54.866Z"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-04T20:51:52.748707Z", "id": "CVE-2026-20006", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-04T20:51:58.937Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability in the TLS cryptography functionality of the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to unexpectedly restart, resulting in a denial of service (DoS) condition.\r\n\r\nThis vulnerability is due to improper implementation of the TLS protocol. An attacker could exploit this vulnerability by sending a crafted TLS packet to an affected system. A successful exploit could allow the attacker to cause a device that is running Cisco Secure FTD Software to drop network traffic, resulting in a DoS condition. \r\nNote: TLS 1.3 is not affected by this vulnerability."}], "id": "CVE-2026-20006", "lastModified": "2026-03-04T18:16:13.803", "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": "Primary"}]}, "published": "2026-03-04T18:16:13.803", "references": [{"source": "psirt@cisco.com", "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-tcp-dos-rHfqnwRg"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-388"}], "source": "psirt@cisco.com", "type": "Primary"}]}

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