---
id: CVE-2020-3186
title: >-
  A vulnerability in the management access list configuration of Cisco Firepower
  Threat Defense (FTD) Software could allow an unauthenticated, remote attacker
  to bypass a configured management interface access list on an affected system
summary: >-
  A vulnerability in the management access list configuration of Cisco Firepower
  Threat Defense (FTD) Software could allow an unauthenticated, remote attacker
  to bypass a configured management interface access list on an affected system.
  T…
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-284
vendor: cisco
product: secure_firewall_threat_defense
affected:
  - 'secure_firewall_threat_defense >= 6.3.0, < 6.3.0.6'
  - 'secure_firewall_threat_defense >= 6.4.0, < 6.4.0.7'
  - 'secure_firewall_threat_defense >= 6.5.0, < 6.5.0.2'
  - asa_5505_firmware = 9.12(1.6)
  - asa_5505_firmware = 201.5(23.16)
  - asa_5510_firmware = 9.12(1.6)
  - asa_5510_firmware = 201.5(23.16)
  - asa_5512-x_firmware = 9.12(1.6)
  - asa_5512-x_firmware = 201.5(23.16)
  - asa_5515-x_firmware = 9.12(1.6)
  - asa_5515-x_firmware = 201.5(23.16)
  - asa_5520_firmware = 9.12(1.6)
  - asa_5520_firmware = 201.5(23.16)
  - asa_5525-x_firmware = 9.12(1.6)
  - asa_5525-x_firmware = 201.5(23.16)
  - asa_5540_firmware = 9.12(1.6)
  - asa_5540_firmware = 201.5(23.16)
  - asa_5545-x_firmware = 9.12(1.6)
  - asa_5545-x_firmware = 201.5(23.16)
  - asa_5550_firmware = 9.12(1.6)
  - asa_5550_firmware = 201.5(23.16)
  - asa_5555-x_firmware = 9.12(1.6)
  - asa_5555-x_firmware = 201.5(23.16)
  - asa_5580_firmware = 9.12(1.6)
  - asa_5580_firmware = 201.5(23.16)
  - asa_5585-x_firmware = 9.12(1.6)
  - asa_5585-x_firmware = 201.5(23.16)
patched:
  - secure_firewall_threat_defense 6.5.0.2
published: '2020-05-06'
updated: '2026-08-11'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-3186'
references:
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-accesslist-bypass-5dZs5qZp
    label: psirt@cisco.com
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-accesslist-bypass-5dZs5qZp
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.01363
epssPercentile: 0.70591
ingestedAt: '2026-08-11T19:48:27.414Z'
---

## Overview

A vulnerability in the management access list configuration of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass a configured management interface access list on an affected system. The vulnerability is due to the configuration of different management access lists, with ports allowed in one access list and denied in another. An attacker could exploit this vulnerability by sending crafted remote management traffic to the local IP address of an affected system. A successful exploit could allow the attacker to bypass the configured management access list policies, and traffic to the management interface would not be properly denied.

## Affected

- `secure_firewall_threat_defense >= 6.3.0, < 6.3.0.6`
- `secure_firewall_threat_defense >= 6.4.0, < 6.4.0.7`
- `secure_firewall_threat_defense >= 6.5.0, < 6.5.0.2`
- `asa_5505_firmware = 9.12(1.6)`
- `asa_5505_firmware = 201.5(23.16)`
- `asa_5510_firmware = 9.12(1.6)`
- `asa_5510_firmware = 201.5(23.16)`
- `asa_5512-x_firmware = 9.12(1.6)`
- `asa_5512-x_firmware = 201.5(23.16)`
- `asa_5515-x_firmware = 9.12(1.6)`
- `asa_5515-x_firmware = 201.5(23.16)`
- `asa_5520_firmware = 9.12(1.6)`
- `asa_5520_firmware = 201.5(23.16)`
- `asa_5525-x_firmware = 9.12(1.6)`
- `asa_5525-x_firmware = 201.5(23.16)`
- `asa_5540_firmware = 9.12(1.6)`
- `asa_5540_firmware = 201.5(23.16)`
- `asa_5545-x_firmware = 9.12(1.6)`
- `asa_5545-x_firmware = 201.5(23.16)`
- `asa_5550_firmware = 9.12(1.6)`
- `asa_5550_firmware = 201.5(23.16)`
- `asa_5555-x_firmware = 9.12(1.6)`
- `asa_5555-x_firmware = 201.5(23.16)`
- `asa_5580_firmware = 9.12(1.6)`
- `asa_5580_firmware = 201.5(23.16)`
- `asa_5585-x_firmware = 9.12(1.6)`
- `asa_5585-x_firmware = 201.5(23.16)`

## Remediation

Upgrade past the affected range:

- `secure_firewall_threat_defense 6.5.0.2`