CVE-2026-20007

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"descriptions": [{"lang": "en", "value": "A vulnerability in the Snort 2 and Snort 3 deep packet inspection of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured Snort rules and allow traffic onto the network that should have been dropped.\r\n\r\nThis vulnerability is due to a logic error in the integration of the Snort Engine rules with Cisco Secure FTD Software that could allow different Snort rules to be hit when deep inspection of the packet is performed for the inner and outer connections. An attacker could exploit this vulnerability by sending crafted traffic to a targeted device that would hit configured Snort rules. A successful exploit could allow the attacker to send traffic to a network where it should have been denied."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "cwe", "cweId": "CWE-284", "description": "Improper Access Control"}]}], "providerMetadata": {"orgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "shortName": "cisco", "dateUpdated": "2026-03-04T17:37:54.913Z"}}}, "cveMetadata": {"cveId": "CVE-2026-20007", "state": "PUBLISHED", "dateUpdated": "2026-03-04T20:51:22.783Z", "dateReserved": "2025-10-08T11:59:15.349Z", "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633", "datePublished": "2026-03-04T17:37:54.913Z", "assignerShortName": "cisco"}, "dataVersion": "5.2"}

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configured Snort rules and allow traffic onto the network that should have been dropped.\r\n\r\nThis vulnerability is due to a logic error in the integration of the Snort Engine rules with Cisco Secure FTD Software that could allow different Snort rules to be hit when deep inspection of the packet is performed for the inner and outer connections. An attacker could exploit this vulnerability by sending crafted traffic to a targeted device that would hit configured Snort rules. A successful exploit could allow the attacker to send traffic to a network where it should have been denied."}, {"lang": "es", "value": "Una vulnerabilidad en la inspecci\u00f3n profunda de paquetes de Snort 2 y Snort 3 del software Cisco Secure Cortafuegos Defensa contra Amenazas (FTD) podr\u00eda permitir a un atacante remoto no autenticado eludir las reglas de Snort configuradas y permitir tr\u00e1fico en la red que deber\u00eda haber sido descartado.\n\nEsta vulnerabilidad se debe a un error de l\u00f3gica en la integraci\u00f3n de las reglas del motor Snort con el software Cisco Secure FTD que podr\u00eda permitir que se activen diferentes reglas de Snort cuando se realiza la inspecci\u00f3n profunda del paquete para las conexiones internas y externas. Un atacante podr\u00eda explotar esta vulnerabilidad enviando tr\u00e1fico manipulado a un dispositivo objetivo que activar\u00eda las reglas de Snort configuradas. Un exploit exitoso podr\u00eda permitir al atacante enviar tr\u00e1fico a una red donde deber\u00eda haber sido denegado."}], "id": "CVE-2026-20007", "lastModified": "2026-08-20T16:42:55.440", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N", "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-2026-20007", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-04T20:51:16.434670Z", "version": "2.0.3"}}]}, "published": "2026-03-04T18:16:14.063", "references": [{"source": "psirt@cisco.com", "tags": ["Vendor Advisory"], "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-snort-bypass-rLggKzVF"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-284"}], "source": "psirt@cisco.com", "type": "Secondary"}]}

{}

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null, "status": "affected", "versions": {"scheme": "semver", "value": "7.7.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.4.2.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.2.10"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.6.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.4.2.3"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.0.8"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.6.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.0.8.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.6.2.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.4.2.4"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.2.10.2"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Cisco Secure Firewall Threat Defense (FTD) Software", "source": "cna", "vendor": "Cisco"}, "product": "secure_firewall_threat_defense", "vendor": "cisco"}], "analysis": {"en": {"generated_at": "2026-04-16T13:22:26.325616+00:00", "value": {"mitigation_remediation": ["Apply the latest Cisco Secure Firewall Threat Defense patch that corrects Snort rule integration.", "Verify that Snort deep packet inspection is actively enabled after patch application.", "Continuously monitor firewall logs for unexpected traffic patterns, and consider temporarily limiting or disabling Snort rules on critical interfaces if suspicious activity persists."], "summary": {"action": "Patch ASAP", "impact": "Unauthorized network traffic bypassing Snort rules"}, "threat_synthesis": {"affected_systems": "Cisco Secure Firewall Threat Defense (FTD) Software is impacted. All installations that use Snort 2 or Snort 3 for deep inspection within the FTD product are susceptible, regardless of version, unless a subsequent patch has been applied.", "description_and_impact": "The vulnerability arises from a logic error in how Cisco Secure Firewall Threat Defense integrates Snort 2 and Snort 3 deep packet inspection rules. An attacker can craft packets that trigger different Snort rule sets for the outer and inner connections, causing the engine to misclassify traffic that should be dropped. The result is that unwanted traffic can enter the protected network, potentially exposing sensitive data or facilitating further attacks.", "risk_and_exploitability": "The CVSS score of 5.8 indicates a medium severity vulnerability. The EPSS score of less than 1% suggests that exploitation is unlikely at present, and the lack of listing in the CISA KEV catalog further indicates low external exploitation pressure. The flaw is exploitable remotely by an unauthenticated attacker who can send crafted traffic. Successful exploitation allows traffic that should be denied to pass through to the internal network."}}}}, "created": "2026-03-05T09:06:22.788638+00:00", "updated": "2026-04-16T13:30:16.047444+00:00", "vendors": ["cisco", "cisco$PRODUCT$secure_firewall_threat_defense"]}