---
id: CVE-2018-15462
title: >-
  A vulnerability in the TCP ingress handler for the data interfaces that are
  configured with management access to Cisco Firepower Threat Defense (FTD)
  Software could allow an unauthenticated, remote attacker to cause an increase
  in CPU an…
summary: >-
  A vulnerability in the TCP ingress handler for the data interfaces that are
  configured with management access to Cisco Firepower Threat Defense (FTD)
  Software could allow an unauthenticated, remote attacker to cause an increase
  in CPU an…
severity: high
cvss: 8.6
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H'
cwe:
  - CWE-399
  - CWE-770
vendor: cisco
product: secure_firewall_threat_defense
affected:
  - secure_firewall_threat_defense < 6.2.3.12
  - 'secure_firewall_threat_defense >= 6.3.0, < 6.3.0.3'
patched:
  - secure_firewall_threat_defense 6.3.0.3
published: '2019-05-03'
updated: '2026-08-11'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2018-15462'
references:
  - url: 'http://www.securityfocus.com/bid/108178'
    label: psirt@cisco.com
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-firepower-dos
    label: psirt@cisco.com
  - url: 'http://www.securityfocus.com/bid/108178'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-firepower-dos
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.02056
epssPercentile: 0.80446
ingestedAt: '2026-08-11T19:48:26.110Z'
---

## Overview

A vulnerability in the TCP ingress handler for the data interfaces that are configured with management access to Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an increase in CPU and memory usage, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient ingress TCP rate limiting for TCP ports 22 (SSH) and 443 (HTTPS). An attacker could exploit this vulnerability by sending a crafted, steady stream of TCP traffic to port 22 or 443 on the data interfaces that are configured with management access to the affected device.

## Affected

- `secure_firewall_threat_defense < 6.2.3.12`
- `secure_firewall_threat_defense >= 6.3.0, < 6.3.0.3`

## Remediation

Upgrade past the affected range:

- `secure_firewall_threat_defense 6.3.0.3`