---
title: "CVE-2026-76418: Cisco Secure Firewall ASA & FTD - Denial of Service"
description: "Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software contain a denial of service caused by logic errors in Remote Access SSL VPN secondary authentication, letting unauthenticated remote attackers cause device reloads, exploit requires crafted request to SSL VPN."
url: https://panop.io/threat-heartbeat/CVE-2026-76418/
---

# CVE-2026-76418 Cisco Secure Firewall ASA & FTD - Denial of Service

Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software contain a denial of service caused by logic errors in Remote Access SSL VPN secondary authentication, letting unauthenticated remote attackers cause device reloads, exploit requires crafted request to SSL VPN.

CVSS base score 8.6 /10

High

CISA KEV

Exploited in the wild

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-76418)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Published

28 October 2026

Updated

29 October 2026

Weakness

[CWE-690](https://cwe.mitre.org/data/definitions/690.html)

## Vendor fix

Update to the latest available version of Cisco Secure Firewall ASA and FTD Software.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-76418](https://nvd.nist.gov/vuln/detail/CVE-2026-76418)
- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tunnel-dos-s6mgkb75](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-tunnel-dos-s6mgkb75)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)