{"id":"CVE-2026-20295","title":"A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure FMC Software and Cisco Secure FTD Software could allow an unauthenticated, remote attacker to exhaust the available memory of an affected device.\r\n\r\nThis…","summary":"A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure FMC Software and Cisco Secure FTD Software could allow an unauthenticated, remote attacker to exhaust the available memory of an affected device.\r\n\r\nThis…","severity":"high","cvss":8.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","cwe":["CWE-789"],"vendor":"Cisco","product":"Cisco Secure Firewall Management Center (FMC)","affected":["secure_firewall_management_center_fmc 7.0.0","secure_firewall_management_center_fmc 7.0.0.1","secure_firewall_management_center_fmc 7.0.1","secure_firewall_management_center_fmc 7.0.1.1","secure_firewall_management_center_fmc 7.0.2","secure_firewall_management_center_fmc 7.2.0","secure_firewall_management_center_fmc 7.0.2.1","secure_firewall_management_center_fmc 7.0.3","secure_firewall_management_center_fmc 7.2.0.1","secure_firewall_management_center_fmc 7.0.4","secure_firewall_management_center_fmc 7.2.1","secure_firewall_management_center_fmc 7.0.5","secure_firewall_management_center_fmc 7.3.0","secure_firewall_management_center_fmc 7.2.2","secure_firewall_management_center_fmc 7.3.1","secure_firewall_management_center_fmc 7.2.3","secure_firewall_management_center_fmc 7.2.3.1","secure_firewall_management_center_fmc 7.2.4","secure_firewall_management_center_fmc 7.0.6","secure_firewall_management_center_fmc 7.2.4.1","secure_firewall_management_center_fmc 7.2.5","secure_firewall_management_center_fmc 7.3.1.1","secure_firewall_management_center_fmc 7.4.0","secure_firewall_management_center_fmc 7.0.6.1","secure_firewall_management_center_fmc 7.2.5.1","secure_firewall_management_center_fmc 7.4.1","secure_firewall_management_center_fmc 7.2.6","secure_firewall_management_center_fmc 7.4.1.1","secure_firewall_management_center_fmc 7.0.6.2","secure_firewall_management_center_fmc 7.2.7","secure_firewall_management_center_fmc 7.2.5.2","secure_firewall_management_center_fmc 7.3.1.2","secure_firewall_management_center_fmc 7.2.8","secure_firewall_management_center_fmc 7.6.0","secure_firewall_management_center_fmc 7.4.2","secure_firewall_management_center_fmc 7.2.8.1","secure_firewall_management_center_fmc 7.0.6.3","secure_firewall_management_center_fmc 7.4.2.1","secure_firewall_management_center_fmc 7.2.9","secure_firewall_management_center_fmc 7.0.7","secure_firewall_management_center_fmc 7.7.0","secure_firewall_management_center_fmc 7.4.2.2","secure_firewall_management_center_fmc 7.2.10","secure_firewall_management_center_fmc 7.6.1","secure_firewall_management_center_fmc 7.4.2.3","secure_firewall_management_center_fmc 7.0.8","secure_firewall_management_center_fmc 7.6.2","secure_firewall_management_center_fmc 7.7.10","secure_firewall_management_center_fmc 7.2.10.1","secure_firewall_management_center_fmc 7.0.8.1"],"published":"2026-09-16","updated":"2026-09-18","sourceUpdated":"2026-09-18T13:28:28.567","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-20295","references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmcftd-sftun-multivulns-WGVHOrN3","label":"psirt@cisco.com"},{"url":"https://software.cisco.com"}],"tags":["nvd","cve.org","csaf","vendor-advisory","cisco"],"epss":0.00549,"epssPercentile":0.44819,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-17T13:34:54.339532Z"},"ingestedAt":"2026-09-16T16:37:52.184Z","slug":"CVE-2026-20295","body":"## Overview\n\nA vulnerability in the sftunnel inter-device communication protocol of Cisco Secure FMC Software and Cisco Secure FTD Software could allow an unauthenticated, remote attacker to exhaust the available memory of an affected device.\r\n\r\nThis vulnerability is due to improper management of memory resources during sftunnel TLS connection setup. An attacker could exploit this vulnerability by sending crafted sftunnel TLS frames to an affected device during the connection setup. A successful exploit could allow the attacker to exhaust the available memory on the affected device, which could result in a DoS condition.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **cisco-sa-fmcftd-sftun-multivulns-WGVHOrN3** · Cisco · affected: Cisco Firepower 2100 Series, Cisco Firepower 1000 Series, Cisco ASA 5500-X Series Firewalls, Cisco 3000 Series Industrial Security Appliances (ISA), Cisco Firepower 9000 Series, Cisco Firepower 4100 Series, … · updated 2026-09-16 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmcftd-sftun-multivulns-WGVHOrN3)","depth":"twilight","depthScore":47,"depthScoreParts":{"impact":47.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}