Denial of Service Vulnerability in Cisco Secure Firewall Adaptive Security Appliance and Threat Defense Software
CVE-2026-76418

8.6HIGH

Key Information:

Vendor

Cisco
Status
Cisco Secure Firewall Adaptive Security Appliance (asa) Software
Cisco Secure Firewall Threat Defense (ftd) Software
Vendor
CVE Published:
28 October 2026

Badges

👾 Exploit Exists

What is CVE-2026-76418?

A logic error in the Cisco Secure Firewall Adaptive Security Appliance and Threat Defense Software's Remote Access SSL VPN service permits unauthenticated attackers to exploit secondary authentication configurations. This vulnerability enables attackers to send a specially crafted request that could force the device to reboot unexpectedly, leading to a denial of service condition. Mitigation strategies should be considered to protect against unauthorized access and system instability.

Affected Version(s)

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.1

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.1.28

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.16.2

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
8.6
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.