CVE-2026-20050

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An attacker could exploit this vulnerability by sending crafted TLS 1.2 encrypted traffic through an affected device. A successful exploit could allow the attacker to cause a reload of an affected device.\r\nNote: This vulnerability only affects traffic that is encrypted by TLS 1.2. Other versions of TLS are not affected."}, {"lang": "es", "value": "Una vulnerabilidad en la funci\u00f3n de exclusi\u00f3n Do Not Decrypt de la funci\u00f3n de descifrado SSL de Cisco Secure Firewall Threat Defense (FTD) Software podr\u00eda permitir a un atacante remoto no autenticado causar una condici\u00f3n de denegaci\u00f3n de servicio (DoS) en un dispositivo afectado.\n\nEsta vulnerabilidad se debe a una gesti\u00f3n de memoria inadecuada durante la inspecci\u00f3n del tr\u00e1fico cifrado TLS 1.2. Un atacante podr\u00eda explotar esta vulnerabilidad enviando tr\u00e1fico cifrado TLS 1.2 manipulado a trav\u00e9s de un dispositivo afectado. Un exploit exitoso podr\u00eda permitir al atacante causar una recarga de un dispositivo afectado.\nNota: Esta vulnerabilidad solo afecta al tr\u00e1fico que est\u00e1 cifrado por TLS 1.2. Otras versiones de TLS no se ven afectadas."}], "id": "CVE-2026-20050", "lastModified": "2026-08-11T19:40:47.230", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 4.0, "source": "psirt@cisco.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-20050", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-04T20:47:03.277099Z", "version": "2.0.3"}}]}, "published": "2026-03-04T18:16:19.173", "references": [{"source": "psirt@cisco.com", "tags": ["Vendor Advisory"], "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-dnd-dos-bpEcg7B7"}], "sourceIdentifier": "psirt@cisco.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-404"}], "source": "psirt@cisco.com", "type": "Secondary"}]}

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"semver", "value": "7.2.4"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.0.6"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.2.5"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.0.6.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.2.5.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.4.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.0.6.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.2.5.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.4.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.2.6"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.0.6.3"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.4.1.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.2.7"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.3.1.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.6.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.4.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.2.8"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.6.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.4.2.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.2.9"}}, {"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": "7.0.7"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.7.0"}}, {"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": "semver", "value": "7.4.3"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.7.10"}}, {"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": "7.7.10.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.4.2.4"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.2.10.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "7.0.9"}}], "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": "2026-04-16T13:21:23.356471+00:00", "value": {"mitigation_remediation": ["Apply the latest Cisco Secure Firewall Threat Defense firmware update that addresses the TLS\u202f1.2 decryption memory management issue.", "If a patch cannot be applied immediately, block or filter outbound/inbound TLS\u202f1.2 traffic to the device or disable SSL inspection for the affected traffic.", "Continuously monitor firewall logs and system status for unexpected reloads or performance degradation, and adjust inspection rules accordingly."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Cisco Secure Firewall Threat Defense (FTD) software is affected. All devices running the Do Not Decrypt exclusion feature with TLS\u202f1.2 decryption enabled may be vulnerable. No specific version range is provided in the advisory, so operators should verify whether their deployed firmware includes the fix following the vendor\u2019s guidance.", "description_and_impact": "The vulnerability arises from improper memory management within Cisco Secure Firewall Threat Defense\u2019s decryption engine when processing TLS\u202f1.2 traffic. An unauthenticated attacker can fabricate TLS\u202f1.2 packets that trigger a memory corruption, causing the device to reload and disrupting network services. This results in a denial\u2011of\u2011service condition that affects all management and traffic functions of the affected device. The weakness is a classic memory leak/overflow issue classified under CWE\u2011404.", "risk_and_exploitability": "The CVSS\u202fv3.1 base score of 6.8 indicates a moderate severity. The EPSS score is reported as less than\u202f1\u202f%, implying a low likelihood of exploitation in the wild, and the vulnerability is not listed in CISA\u2019s KEV catalog. Nonetheless, the attack vector is remote, unauthenticated, and only requires the ability to inject crafted TLS\u202f1.2 traffic, which is feasible for anyone who can reach the firewall over the network."}}}}, "created": "2026-03-05T09:06:20.050399+00:00", "updated": "2026-04-16T13:30:16.043709+00:00", "vendors": ["cisco", "cisco$PRODUCT$secure_firewall_threat_defense"]}