8.6High

Cisco Secure Firewall Threat Defense

CVE-2018-0240

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.

What this means for your business

  • It affects Cisco Secure Firewall Threat Defense. It matters if your company, or a supplier that handles your data, runs it.
  • An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.
  • FIRST's prediction model gives it a 4% chance of attack attempts being seen in the next 30 days, ranking above 89% of all known flaws.

What to do

  1. 1Check whether your company or your suppliers run Cisco Secure Firewall Threat Defense, and which version. The affected versions are listed further down this page.
  2. 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.

Not sure if your company is exposed?

Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.

Scoring

CVSS
8.6 (v3.1)
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Weakness
CWE-399
Assigned by
psirt@cisco.com

Dates

Published
2018-04-19
Last modified
2026-08-11
Sources
NVD

Affected products

  • Cisco Secure Firewall Threat Defense6.1.0 - 6.1.0.7, 6.2.0 - 6.2.0.5, 6.2.1 - 6.2.2.2
  • Cisco Adaptive Security Appliance Software9.6.0.0 - 9.6.4.6, 9.7.0.0 - 9.7.1.24, 9.8.0.0 - 9.8.2.24, 9.9.0.0 - 9.9.1.4
  • Cisco Adaptive Security Virtual Applianceall versions
  • Cisco Firepower Threat Defense Virtualall versions
  • Cisco 7604all versions
  • Cisco 7606-Sall versions
  • Cisco 7609-Sall versions
  • Cisco 7613-Sall versions
  • Cisco Asa-5505all versions
  • Cisco Asa-5506-Xall versions
  • Cisco Asa-5506h-Xall versions
  • Cisco Asa-5512-Xall versions

As listed in the NVD configuration data. Not a statement about your estate.

References