---
title: "Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) — CVE-2026-20349"
description: "A denial of service flaw affects Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD). Apply the vendor’s patch. It is being actively exploited: patch now."
canonical: https://inyourgeek.com/en/failles-de-securite/2026-08-11-cve-2026-20349
type: faille-de-securite
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-08-11
dateModified: 2026-08-11
---
# Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) — CVE-2026-20349

A denial of service flaw affects Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD). Apply the vendor’s patch. It is being actively exploited: patch now.

## What to do

Check the vendor advisory for the fixed version. This flaw is being actively exploited: patch now.

| Fact | Value |
| --- | --- |
| Ecosystem | Network appliance |
| Class | Denial of service |
| CVE | CVE-2026-20349 |
| Published on | August 11, 2026 |
| Severity | Critical |

## Sources

- [CISA KEV — CVE-2026-20349](https://www.cisa.gov/known-exploited-vulnerabilities-catalog) — CISA Known Exploited Vulnerabilities
- [NVD — CVE-2026-20349](https://nvd.nist.gov/vuln/detail/CVE-2026-20349) — NVD

---

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Full register : https://inyourgeek.com/en/failles-de-securite