---
id: CVE-2018-0240
title: >-
  Multiple vulnerabilities in the Application Layer Protocol Inspection feature
  of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat
  Defense (FTD) Software could allow an unauthenticated, remote attacker to
  trigge…
summary: >-
  Multiple vulnerabilities in the Application Layer Protocol Inspection feature
  of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat
  Defense (FTD) Software could allow an unauthenticated, remote attacker to
  trigge…
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-399
vendor: cisco
product: secure_firewall_threat_defense
affected:
  - 'secure_firewall_threat_defense >= 6.1.0, <= 6.1.0.7'
  - 'secure_firewall_threat_defense >= 6.2.0, < 6.2.0.5'
  - 'secure_firewall_threat_defense >= 6.2.1, < 6.2.2.2'
  - 'adaptive_security_appliance_software >= 9.6.0.0, < 9.6.4.6'
  - 'adaptive_security_appliance_software >= 9.7.0.0, < 9.7.1.24'
  - 'adaptive_security_appliance_software >= 9.8.0.0, < 9.8.2.24'
  - 'adaptive_security_appliance_software >= 9.9.0.0, < 9.9.1.4'
patched:
  - secure_firewall_threat_defense 6.2.2.2
  - adaptive_security_appliance_software 9.9.1.4
published: '2018-04-19'
updated: '2026-08-11'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2018-0240'
references:
  - url: 'http://www.securityfocus.com/bid/103934'
    label: psirt@cisco.com
  - url: 'http://www.securitytracker.com/id/1040722'
    label: psirt@cisco.com
  - url: 'https://ics-cert.us-cert.gov/advisories/ICSA-18-184-01'
    label: psirt@cisco.com
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa_inspect
    label: psirt@cisco.com
  - url: 'http://www.securityfocus.com/bid/103934'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://www.securitytracker.com/id/1040722'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://ics-cert.us-cert.gov/advisories/ICSA-18-184-01'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa_inspect
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.0386
epssPercentile: 0.89728
ingestedAt: '2026-08-11T19:48:25.608Z'
---

## Overview

Multiple vulnerabilities in the Application Layer Protocol Inspection feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerabilities are due to logical errors during traffic inspection. An attacker could exploit these vulnerabilities by sending a high volume of malicious traffic across an affected device. An exploit could allow the attacker to cause a deadlock condition, resulting in a reload of an affected device. These vulnerabilities affect Cisco ASA Software and Cisco FTD Software configured for Application Layer Protocol Inspection running on the following Cisco products: 3000 Series Industrial Security Appliance (ISA), ASA 5500 Series Adaptive Security Appliances, ASA 5500-X Series Next-Generation Firewalls, ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, Adaptive Security Virtual Appliance (ASAv), Firepower 2100 Series Security Appliance, Firepower 4100 Series Security Appliance, Firepower 9300 ASA Security Module, FTD Virtual (FTDv). Cisco Bug IDs: CSCve61540, CSCvh23085, CSCvh95456.

## Affected

- `secure_firewall_threat_defense >= 6.1.0, <= 6.1.0.7`
- `secure_firewall_threat_defense >= 6.2.0, < 6.2.0.5`
- `secure_firewall_threat_defense >= 6.2.1, < 6.2.2.2`
- `adaptive_security_appliance_software >= 9.6.0.0, < 9.6.4.6`
- `adaptive_security_appliance_software >= 9.7.0.0, < 9.7.1.24`
- `adaptive_security_appliance_software >= 9.8.0.0, < 9.8.2.24`
- `adaptive_security_appliance_software >= 9.9.0.0, < 9.9.1.4`

## Remediation

Upgrade past the affected range:

- `secure_firewall_threat_defense 6.2.2.2`
- `adaptive_security_appliance_software 9.9.1.4`