CVE-2026-76418 Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Tunnel Denial of Service Vulnerability
HighCVSS 8.6
EPSS 0.82%
CISA KEV
added 2026-10-29 · due 2026-11-01
Exploited in the wild
- Published
- Updated
- Exploit status
- Exploited in the wild (confirmed)
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.
CISA Known Exploited Vulnerability
- Date added
- 2026-10-29
- Due date (FCEB)
- 2026-11-01
- Ransomware use
- Unknown
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.1 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.1.28 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.2 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.2.3 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.2.7 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.2.11 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.2.13 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.2.14 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.3.3 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.3 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.3.14 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.1 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.3.15 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.1.3 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.2 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.3.19 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.3.23 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.2.5 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.2.7 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.19.1 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.9 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.2.8 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.14 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.3 | No fix listed |
Show 175 more
| Product | Affected versions | Fixed in |
|---|---|---|
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.19.1.5 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.18 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.19.1.9 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.3.39 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.19 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.19.1.12 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.3.46 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.27 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.19.1.18 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.3.53 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.3.55 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.38 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.39 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.3.56 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.1 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.42 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.19.1.22 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.1.5 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.5 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.19.1.24 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.48 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.8 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.2 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.19.1.27 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.55 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.22 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.2.10 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.57 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.19.1.28 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.24 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.2.21 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.61 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.19.1.31 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.29 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.2.22 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.62 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.34 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.3 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.67 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.70 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.40 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.23.1 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.22.1.1 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.71 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.3.4 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.47 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.3.7 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.19.1.37 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.76 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.3.9 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.19.1.38 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.50 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.22.1.3 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.3.10 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.22.1.2 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.52 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.3.13 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.22.1.6 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.53 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.82 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.22.2 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.3.16 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.19.1.42 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.57 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.84 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.23.1.3 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.3.20 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.22.2.4 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.23.1.7 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.4 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.22.2.9 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.23.1.13 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.4.7 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.22.2.13 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.66 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.4.10 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.23.1.19 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.85 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.22.2.14 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.67 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.24.1 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.68 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.23.1.22 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.4.14 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.22.2.20 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.71 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.4.19 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.23.1.26 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.89 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.22.2.32 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.76 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.22.3 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.24.1.5 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.4.22 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.24.1.9 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.4.28 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.22.3.5 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.92 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.135 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.23.1.195 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.4.30 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.24.1.155 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.23.1.32 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.24.1.11 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.4.34 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.82 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.24.10 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.90 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.4.46 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.4.235 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.20.4.49 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.22.3.26 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.16.4.103 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.18.4.94 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.23.1.47 | No fix listed |
| Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | = 9.24.1.26 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.0 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.0.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.1.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.2 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.0 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.2.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.3 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.0.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.4 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.5 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.3.0 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.2 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.3 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.3.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.4 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.6 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.5 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.4.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.3.1.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.4.0 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.6.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.5.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.4.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.6 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.6.2 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.4.1.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.7 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.5.2 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.3.1.2 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.8 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.6.0 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.4.2 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.8.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.6.3 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.4.2.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.9 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.7 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.7.0 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.4.2.2 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.10 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.6.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.4.2.3 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.8 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.6.2 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.7.10 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.7.11 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.8.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.6.2.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.7.10.1 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.4.2.4 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.2.10.2 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.4.3 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.6.4 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 10.0.0 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.4.4 | No fix listed |
| Cisco Secure Firewall Threat Defense (FTD) Software | = 7.0.9 | No fix listed |
References
- cisco-sa-asaftd-tunnel-dos-s6mgkb75 vendor-advisory
- www.cisa.gov government-resource us-government-resource