{"api_version":"1","generated_at":"2026-09-17T07:50:39+00:00","cve":"CVE-2026-20323","urls":{"html":"https://cve.report/CVE-2026-20323","api":"https://cve.report/api/cve/CVE-2026-20323.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-20323","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-20323"},"summary":{"title":"Cisco Secure Firewall Management Center and Secure Firewall Threat Defense Software sftunnel Unauthorized Authentication Bypass Vulnerability","description":"A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure FMC Software and Cisco Secure FTD Software could allow an unauthenticated, adjacent attacker to impersonate the peer device and obtain access at the level of the manager role, which is equivalent to root.\r\n\r\nThis vulnerability is due to improper management of the TLS certificate for the sftunnel management connection. An attacker could exploit this vulnerability by connecting to the sftunnel port using a crafted TLS certificate. A successful exploit could allow the attacker to become a registered sftunnel peer with root access.\r\nNote: The attack is successful only if the sftunnel connection is down or the attack can disrupt the sftunnel connection long enough to execute the attack.","state":"PUBLISHED","assigner":"cisco","published_at":"2026-09-16 21:17:10","updated_at":"2026-09-17 04:17:41"},"problem_types":["CWE-295","CWE-295 Improper Certificate Validation"],"metrics":[{"version":"3.1","source":"psirt@cisco.com","type":"Secondary","score":"8.3","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","baseScore":8.3,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"CVSSV3_1","score":"8.3","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","data":{"attackComplexity":"HIGH","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":8.3,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmcftd-sftun-multivulns-WGVHOrN3","name":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmcftd-sftun-multivulns-WGVHOrN3","refsource":"psirt@cisco.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-20323","name":"CVE 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Secure Firewall Threat Defense (FTD) Software","vendor":"Cisco","versions":[{"status":"affected","version":"7.0.0"},{"status":"affected","version":"7.0.0.1"},{"status":"affected","version":"7.0.1"},{"status":"affected","version":"7.0.1.1"},{"status":"affected","version":"7.0.2"},{"status":"affected","version":"7.2.0"},{"status":"affected","version":"7.0.2.1"},{"status":"affected","version":"7.0.3"},{"status":"affected","version":"7.2.0.1"},{"status":"affected","version":"7.0.4"},{"status":"affected","version":"7.2.1"},{"status":"affected","version":"7.0.5"},{"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":"7.0.6"},{"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":"7.0.6.1"},{"status":"affected","version":"7.2.5.1"},{"status":"affected","version":"7.4.1"},{"status":"affected","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":"7.7.11"},{"status":"affected","version":"7.0.8.1"},{"status":"affected","version":"7.6.2.1"},{"status":"affected","version":"7.7.10.1"},{"status":"affected","version":"7.4.2.4"},{"status":"affected","version":"7.2.10.2"},{"status":"affected","version":"7.4.3"},{"status":"affected","version":"7.6.4"},{"status":"affected","version":"10.0.0"},{"status":"affected","version":"7.4.4"},{"status":"affected","version":"7.0.9"},{"status":"affected","version":"7.2.11"},{"status":"affected","version":"7.4.7"},{"status":"affected","version":"7.0.10"}]}],"descriptions":[{"lang":"en","value":"A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure FMC Software and Cisco Secure FTD Software could allow an unauthenticated, adjacent attacker to impersonate the peer device and obtain access at the level of the manager role, which is equivalent to root.\r\n\r\nThis vulnerability is due to improper management of the TLS certificate for the sftunnel management connection. An attacker could exploit this vulnerability by connecting to the sftunnel port using a crafted TLS certificate. A successful exploit could allow the attacker to become a registered sftunnel peer with root access.\r\nNote: The attack is successful only if the sftunnel connection is down or the attack can disrupt the sftunnel connection long enough to execute the attack."}],"exploits":[{"lang":"en","value":"The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":8.3,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"format":"cvssV3_1"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-295","description":"Improper Certificate Validation","lang":"en","type":"cwe"}]}],"providerMetadata":{"dateUpdated":"2026-09-16T20:15:35.850Z","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","shortName":"cisco"},"references":[{"name":"cisco-sa-fmcftd-sftun-multivulns-WGVHOrN3","url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmcftd-sftun-multivulns-WGVHOrN3"}],"source":{"advisory":"cisco-sa-fmcftd-sftun-multivulns-WGVHOrN3","defects":["CSCwu16917"],"discovery":"INTERNAL"},"title":"Cisco Secure Firewall Management Center and Secure Firewall Threat Defense Software sftunnel Unauthorized Authentication Bypass Vulnerability"}},"cveMetadata":{"assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","assignerShortName":"cisco","cveId":"CVE-2026-20323","datePublished":"2026-09-16T20:15:35.850Z","dateReserved":"2025-10-08T11:59:15.411Z","dateUpdated":"2026-09-17T03:57:38.812Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 21:17:10","lastModifiedDate":"2026-09-17 04:17:41","problem_types":["CWE-295","CWE-295 Improper Certificate Validation"],"metrics":{"cvssMetricV31":[{"source":"psirt@cisco.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","baseScore":8.3,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.6,"impactScore":6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-16T00:00:00+00:00","id":"CVE-2026-20323","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"20323","Ordinal":"1","Title":"Cisco Secure Firewall Management Center and Secure Firewall Thre","CVE":"CVE-2026-20323","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"20323","Ordinal":"1","NoteData":"A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure FMC Software and Cisco Secure FTD Software could allow an unauthenticated, adjacent attacker to impersonate the peer device and obtain access at the level of the manager role, which is equivalent to root.\r\n\r\nThis vulnerability is due to improper management of the TLS certificate for the sftunnel management connection. An attacker could exploit this vulnerability by connecting to the sftunnel port using a crafted TLS certificate. A successful exploit could allow the attacker to become a registered sftunnel peer with root access.\r\nNote: The attack is successful only if the sftunnel connection is down or the attack can disrupt the sftunnel connection long enough to execute the attack.","Type":"Description","Title":"Cisco Secure Firewall Management Center and Secure Firewall Thre"}]}}}