---
id: CVE-2020-3578
title: >-
  A vulnerability in the web services interface of Cisco Adaptive Security
  Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software
  could allow an unauthenticated, remote attacker to bypass a configured access
  rule and ac…
summary: >-
  A vulnerability in the web services interface of Cisco Adaptive Security
  Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software
  could allow an unauthenticated, remote attacker to bypass a configured access
  rule and ac…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-863
  - CWE-863
vendor: cisco
product: secure_firewall_threat_defense
affected:
  - 'secure_firewall_threat_defense >= 6.4.0, < 6.4.0.10'
  - firepower_threat_defense < 6.3.0.6
  - 'firepower_threat_defense >= 6.5.0, < 6.5.0.5'
  - 'firepower_threat_defense >= 6.6.0, < 6.6.1'
  - adaptive_security_appliance_software < 9.6.4.45
  - 'adaptive_security_appliance_software >= 9.7, < 9.8.4.26'
  - 'adaptive_security_appliance_software >= 9.9, < 9.9.2.80'
  - 'adaptive_security_appliance_software >= 9.10, < 9.10.1.44'
  - 'adaptive_security_appliance_software >= 9.12, < 9.12.4.4'
  - 'adaptive_security_appliance_software >= 9.13, < 9.13.1.13'
  - 'adaptive_security_appliance_software >= 9.14, < 9.14.1.19'
patched:
  - secure_firewall_threat_defense 6.4.0.10
  - firepower_threat_defense 6.6.1
  - adaptive_security_appliance_software 9.14.1.19
published: '2020-10-21'
updated: '2026-08-11'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-3578'
references:
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-P73ABNWQ
    label: psirt@cisco.com
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-P73ABNWQ
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.01232
epssPercentile: 0.67171
ingestedAt: '2026-08-18T12:28:06.503Z'
---

## Overview

A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass a configured access rule and access parts of the WebVPN portal that are supposed to be blocked. The vulnerability is due to insufficient validation of URLs when portal access rules are configured. An attacker could exploit this vulnerability by accessing certain URLs on the affected device.

## Affected

- `secure_firewall_threat_defense >= 6.4.0, < 6.4.0.10`
- `firepower_threat_defense < 6.3.0.6`
- `firepower_threat_defense >= 6.5.0, < 6.5.0.5`
- `firepower_threat_defense >= 6.6.0, < 6.6.1`
- `adaptive_security_appliance_software < 9.6.4.45`
- `adaptive_security_appliance_software >= 9.7, < 9.8.4.26`
- `adaptive_security_appliance_software >= 9.9, < 9.9.2.80`
- `adaptive_security_appliance_software >= 9.10, < 9.10.1.44`
- `adaptive_security_appliance_software >= 9.12, < 9.12.4.4`
- `adaptive_security_appliance_software >= 9.13, < 9.13.1.13`
- `adaptive_security_appliance_software >= 9.14, < 9.14.1.19`

## Remediation

Upgrade past the affected range:

- `secure_firewall_threat_defense 6.4.0.10`
- `firepower_threat_defense 6.6.1`
- `adaptive_security_appliance_software 9.14.1.19`