← Back to Vulnerability Reports CVE Intelligence

CVE-2026-76418

Cisco Secure Firewall ASA Software And Cisco Secure FTD Software•HIGH · CVSS 8.6• In the wild In CISA KEV

What is CVE-2026-76418?

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.

CVSS8.6 NVD 3.1
SeverityHIGH
Exploitation In the wild In CISA KEV
EPSS1% · P47
Triage statusActive Exploit
ActionPatch immediately
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWECWE-690
NVD published2026-10-28
NVD last modified2026-10-30

Timeline

  • 2026-10-28Published to the U.S. National Vulnerability Database (NVD)
  • 2026-10-29Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
  • 2026-10-30NVD record last updated
  • 2026-11-01CISA federal remediation deadline (BOD 22-01)

CISA Known Exploited Vulnerability

Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability

Added to KEV2026-10-29
Federal patch deadline2026-11-01
Known ransomware useUnknown

Affected product

Cisco Secure Firewall ASA Software And Cisco Secure FTD Software

Remediation Steps

  1. Apply the vendor security update for Cisco Secure Firewall ASA Software And Cisco Secure FTD Software as a priority.
  2. Restrict network exposure of the affected service to trusted sources until patched.
  3. Review logs and detections for indicators of exploitation.
  4. Confirm fixed versions against the official vendor advisory before deploying.

References

Referenced in our briefings & reports

Related vulnerabilities

  • CVE-2026-76519 – Cisco Secure Email Gateway (same vendor)
  • CVE-2026-76504 – Cisco Catalyst SD-WAN Manager (same vendor)
  • CVE-2026-76460 – Cisco Identity Services Engine (same vendor)
  • CVE-2026-76461 – Cisco Secure Email Gateway (same vendor)
  • CVE-2026-20349 – Cisco Secure Firewall Adaptive Security Appliance (ASA) And Secure Firewall Threat Defense (FTD) (same vendor)
  • CVE-2026-20316 – Cisco Secure Firewall Management Center (FMC) (same vendor)

Cisco: 101 known exploited vulnerabilities (CISA KEV) →

Browse all tracked CVEs in the defend.network CVE database →

🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.