high · 8.6Actively exploited

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

CVE-2026-76418 · GHSA-3whv-82g3-5cwx · EUVD-2026-112462 · published 28 Oct 2026

Attackers are using this one right now. CISA added it to its Known Exploited Vulnerabilities list on 29 Oct 2026, and US federal agencies had to fix it by 1 Nov 2026. Treat it as urgent.

How serious is it

  • Severity: high, CVSS score 8.6 out of 10.
  • No exploit prediction (EPSS) score yet.
  • Confirmed exploited in the wild (CISA KEV).
  • No public exploit in Exploit-DB.

Is your app affected by CVE-2026-76418?

Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.

Who is affected

  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software: 9.16.2
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software: 7.2.12
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software: 7.0.6.3
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software: 9.16.3.23
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software: 9.16.3.15
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software: 9.16.4.55
  • Cisco Cisco Secure Firewall Threat Defense (FTD) Software: 10.0.0
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software: 9.18.2.5
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software: 9.16.4.67
  • Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software: 9.16.4.27

How to check

  1. Find out whether you run the affected product and which version, then compare it with the versions above.

How to fix

Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
  1. Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
  2. If a vulnerable version was live, check your logs and rotate the secrets that server could read.

The advisory

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.

Check your whole app

Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.

References

Merged from ENISA EUVD, CISA KEV. Last updated 30 Oct 2026. All vulnerabilities · RSS · JSON

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