---
id: CVE-2020-3304
title: >-
  A vulnerability in the web interface of Cisco Adaptive Security Appliance
  (ASA) Software and Firepower Threat Defense (FTD) Software could allow an
  unauthenticated, remote attacker to cause an affected device to reload
  unexpectedly, resu…
summary: >-
  A vulnerability in the web interface of Cisco Adaptive Security Appliance
  (ASA) Software and Firepower Threat Defense (FTD) Software could allow an
  unauthenticated, remote attacker to cause an affected device to reload
  unexpectedly, resu…
severity: high
cvss: 8.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H'
cwe:
  - CWE-400
  - CWE-20
vendor: cisco
product: adaptive_security_appliance
affected:
  - adaptive_security_appliance < 9.6.4.45
  - secure_firewall_threat_defense < 6.3.0.6
  - 'secure_firewall_threat_defense >= 6.4.0, < 6.4.0.10'
  - 'secure_firewall_threat_defense >= 6.5.0, < 6.5.0.5'
  - 'secure_firewall_threat_defense >= 6.6.0, < 6.6.1'
  - 'adaptive_security_appliance_software >= 9.8.0, < 9.8.4.22'
  - 'adaptive_security_appliance_software >= 9.9.0, < 9.9.2.80'
  - 'adaptive_security_appliance_software >= 9.10.0, < 9.10.1.44'
  - 'adaptive_security_appliance_software >= 9.12.0, < 9.12.3.12'
  - 'adaptive_security_appliance_software >= 9.13.0, < 9.13.1.12'
  - 'adaptive_security_appliance_software >= 9.14.0, < 9.14.1.10'
patched:
  - adaptive_security_appliance 9.6.4.45
  - secure_firewall_threat_defense 6.6.1
  - adaptive_security_appliance_software 9.14.1.10
published: '2020-10-21'
updated: '2026-08-11'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-3304'
references:
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webdos-fBzM5Ynw
    label: psirt@cisco.com
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webdos-fBzM5Ynw
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.03908
epssPercentile: 0.89836
ingestedAt: '2026-08-11T19:48:28.378Z'
---

## Overview

A vulnerability in the web interface of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. The vulnerability is due to a lack of proper input validation of HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. An exploit could allow the attacker to cause a DoS condition. Note: This vulnerability applies to IP Version 4 (IPv4) and IP Version 6 (IPv6) HTTP traffic.

## Affected

- `adaptive_security_appliance < 9.6.4.45`
- `secure_firewall_threat_defense < 6.3.0.6`
- `secure_firewall_threat_defense >= 6.4.0, < 6.4.0.10`
- `secure_firewall_threat_defense >= 6.5.0, < 6.5.0.5`
- `secure_firewall_threat_defense >= 6.6.0, < 6.6.1`
- `adaptive_security_appliance_software >= 9.8.0, < 9.8.4.22`
- `adaptive_security_appliance_software >= 9.9.0, < 9.9.2.80`
- `adaptive_security_appliance_software >= 9.10.0, < 9.10.1.44`
- `adaptive_security_appliance_software >= 9.12.0, < 9.12.3.12`
- `adaptive_security_appliance_software >= 9.13.0, < 9.13.1.12`
- `adaptive_security_appliance_software >= 9.14.0, < 9.14.1.10`

## Remediation

Upgrade past the affected range:

- `adaptive_security_appliance 9.6.4.45`
- `secure_firewall_threat_defense 6.6.1`
- `adaptive_security_appliance_software 9.14.1.10`