cisco-sa-fmcftd-sftun-multivulns-WGVHOrN3HighCVSS 8.6

Cisco Secure Firewall Management Center and Secure Firewall Threat Defense Software sftunnel Vulnerabilities

Published
September 16, 2026
Last Modified
September 16, 2026

🔗 CVE IDs covered (2)

CVE-2026-20295 →CVE-2026-20323 →

📋 Description

Multiple vulnerabilities in Cisco Secure Firewall Management Center (FMC) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated attacker to perform an sftunnel authentication bypass or sftunnel denial of service (DoS) attack.

For more information about these vulnerabilities, see the Details ["#details"] section of this advisory.

Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.

This advisory is part of a group of advisories. For a complete list of the advisories and links to them, see Cisco Advance Notification for Publication of September 16, 2026, Security Advisories ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-notice-jfxK98ZP"]. In addition, for further documentation of improvements and fixes in Cisco Secure Firewall products, see Cisco Secure Firewall Adaptive Security Appliance Software, Secure Firewall Threat Defense Software, and Secure Firewall Management Center Software Hardening Release: September 2026 ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-asaftdfmc-uvpPROhN"].

CVE-2026-20295 — Cisco Secure Firewall Management Center and Secure Firewall Threat Defense Software sftunnel Memory Exhaustion Denial of Service Vulnerability (CVSS 3.1 8.6, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H) CVE-2026-20323 — Cisco Secure Firewall Management Center and Secure Firewall Threat Defense Software sftunnel Unauthorized Authentication Bypass Vulnerability (CVSS 3.1 8.3, CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H)

🎯 Affected products143

  • Cisco 3000 Series Industrial Security Appliances (ISA)
  • Cisco ASA 5500-X Series Firewalls
  • Cisco Firepower 1000 Series
  • Cisco Firepower 2100 Series
  • Cisco Firepower 4100 Series
  • Cisco Firepower 9000 Series
  • Cisco Secure Firewall 1200 Series
  • Cisco Secure Firewall 200 Series
  • Cisco Secure Firewall 3100 Series
  • Cisco Secure Firewall 4200 Series
  • Cisco Secure Firewall 6100 Series
  • Cisco Secure Firewall Management Center (FMC)
  • Cisco Secure Firewall Management Center (FMC) Appliances
  • Cisco Secure Firewall Threat Defense (FTD) Software
  • Cisco Secure Firewall Threat Defense Virtual
  • Cisco Secure Firewall Management Center (FMC) 10.0.0
  • Cisco Secure Firewall Management Center (FMC) 10.0.1
  • Cisco Secure Firewall Management Center (FMC) 7.0.0
  • Cisco Secure Firewall Management Center (FMC) 7.0.0.1
  • Cisco Secure Firewall Management Center (FMC) 7.0.1
  • Cisco Secure Firewall Management Center (FMC) 7.0.1.1
  • Cisco Secure Firewall Management Center (FMC) 7.0.2
  • Cisco Secure Firewall Management Center (FMC) 7.0.2.1
  • Cisco Secure Firewall Management Center (FMC) 7.0.3
  • Cisco Secure Firewall Management Center (FMC) 7.0.4
  • Cisco Secure Firewall Management Center (FMC) 7.0.5
  • Cisco Secure Firewall Management Center (FMC) 7.0.6
  • Cisco Secure Firewall Management Center (FMC) 7.0.6.1
  • Cisco Secure Firewall Management Center (FMC) 7.0.6.2
  • Cisco Secure Firewall Management Center (FMC) 7.0.6.3
  • +113 more not shown

✅ Remediation

Cisco has released software updates that address this vulnerability. https://software.cisco.com Workarounds: There are no workarounds that address these vulnerabilities.

🔗 References (10)