A vulnerability in the Remote Access SSL VPN service of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to logic errors when secondary authentication is configured on a tunnel group. An attacker could exploit this vulnerability by sending a crafted request when connecting to the SSL remote access VPN. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is in the KEV database since Oct. 29, 2026.

Exploitation active

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Cisco
  • Adaptive Security Appliance Software
  • Cisco Secure Firewall Threat Defense (ftd) Software
  • Secure Firewall Threat Defense

Configuration 1 [-]

OR cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.24.10:*:*:*:*:*:*:*

Configuration 2 [-]

OR cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:10.1.0:*:*:*:*:*:*:*

No data.

References
Link Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tunnel-dos-s6mgkb75 cve-icon cve-icon
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76418 cve-icon cve-icon
History

Fri, 30 Oct 2026 10:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:secure_firewall_threat_defense:10.1.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
cpe:2.3:o:cisco:adaptive_security_appliance_software:9.24.10:*:*:*:*:*:*:*

Thu, 29 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

 ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 29 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
References

Thu, 29 Oct 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics kev

{'dateAdded': '2026-10-29T00:00:00+00:00', 'dueDate': '2026-11-01T00:00:00+00:00'}

Thu, 29 Oct 2026 00:15:00 +0000

Type Values Removed Values Added
First Time appeared Cisco
Cisco adaptive Security Appliance Software
Cisco cisco Secure Firewall Threat Defense (ftd) Software
Cisco secure Firewall Threat Defense
Vendors & Products Cisco
Cisco adaptive Security Appliance Software
Cisco cisco Secure Firewall Threat Defense (ftd) Software
Cisco secure Firewall Threat Defense

Wed, 28 Oct 2026 23:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 28 Oct 2026 20:15:00 +0000

Type Values Removed Values Added
Description A vulnerability in the Remote Access SSL VPN service of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to logic errors when secondary authentication is configured on a tunnel group. An attacker could exploit this vulnerability by sending a crafted request when connecting to the SSL remote access VPN. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.
Title Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Tunnel Denial of Service Vulnerability
Weaknesses CWE-690
References
Metrics cvssV3_1

{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H'}
cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published: 2026-10-28T20:05:31.926Z

Updated: 2026-10-30T03:55:57.976Z

Reserved: 2026-08-19T12:02:03.633Z

Link: CVE-2026-76418

cve-icon Vulnrichment

Updated: 2026-10-28T22:46:05.943Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-28T20:18:47.063

Modified: 2026-10-30T10:36:01.130

Link: CVE-2026-76418

cve-icon Redhat

No data.