CyberBrief
Subscribe
8.6High

Cisco Adaptive Security Appliance Software

CVE-2018-15454

A vulnerability in the Session Initiation Protocol (SIP) inspection engine of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload or trigger high CPU, resulting in a denial of service (DoS) condition. The vulnerability is due to improper handling of SIP traffic. An attacker could exploit this vulnerability by sending SIP requests designed to specifically trigger this issue at a high rate across an affected device. Software updates that address this vulnerability are not yet available.

What this means for your business

  • It affects Cisco Adaptive Security Appliance Software. 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 90% of all known flaws.

What to do

  1. 1Check whether your company or your suppliers run Cisco Adaptive Security Appliance Software, 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.

Check if you’re exposedBook a call

Scoring

CVSS
8.6 (v3.0)
Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Weakness
CWE-20
Assigned by
psirt@cisco.com

Dates

Published
2018-11-01
Last modified
2026-08-11
Sources
NVD

Affected products

  • Cisco Adaptive Security Appliance Software9.4 - 9.4.4.27, 9.6 - 9.6.4.18, 9.8 - 9.8.3.16, 9.9 - 9.9.2.32, 9.10 - 9.10.1.2
  • Cisco Secure Firewall Threat Defense6.1.0 - 6.1.0.7, 6.2.0 - 6.2.0.6, 6.2.2 - 6.2.2.4, 6.2.3 - 6.2.3.7

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

References