---
id: CVE-2017-6632
title: >-
  A vulnerability in the logging configuration of Secure Sockets Layer (SSL)
  policies for Cisco FirePOWER System Software 5.3.0 through 6.2.2 could allow
  an unauthenticated, remote attacker to cause a denial of service (DoS)
  condition due …
summary: >-
  A vulnerability in the logging configuration of Secure Sockets Layer (SSL)
  policies for Cisco FirePOWER System Software 5.3.0 through 6.2.2 could allow
  an unauthenticated, remote attacker to cause a denial of service (DoS)
  condition due …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-399
  - CWE-400
vendor: cisco
product: firepower_threat_defense
affected:
  - firepower_threat_defense = 6.2_base
  - secure_firewall_threat_defense = 5.3.0
  - secure_firewall_threat_defense = 5.4.0
  - secure_firewall_threat_defense = 6.0.0
  - secure_firewall_threat_defense = 6.0.1
  - secure_firewall_threat_defense = 6.0.1.3
  - secure_firewall_threat_defense = 6.1.0
  - secure_firewall_threat_defense = 6.1.0.2
  - secure_firewall_threat_defense = 6.2.0
  - secure_firewall_threat_defense = 6.2.1
  - secure_firewall_threat_defense = 6.2.2
published: '2017-05-22'
updated: '2026-08-11'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2017-6632'
references:
  - url: 'http://www.securityfocus.com/bid/98523'
    label: psirt@cisco.com
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170517-fpwr
    label: psirt@cisco.com
  - url: 'http://www.securityfocus.com/bid/98523'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170517-fpwr
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.02258
epssPercentile: 0.82024
ingestedAt: '2026-08-11T19:48:25.369Z'
---

## Overview

A vulnerability in the logging configuration of Secure Sockets Layer (SSL) policies for Cisco FirePOWER System Software 5.3.0 through 6.2.2 could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition due to high consumption of system resources. The vulnerability is due to the logging of certain TCP packets by the affected software. An attacker could exploit this vulnerability by sending a flood of crafted TCP packets to an affected device. A successful exploit could allow the attacker to cause a DoS condition. The success of an exploit is dependent on how an administrator has configured logging for SSL policies for a device. This vulnerability affects Cisco FirePOWER System Software that is configured to log connections by using SSL policy default actions. Cisco Bug IDs: CSCvd07072.

## Affected

- `firepower_threat_defense = 6.2_base`
- `secure_firewall_threat_defense = 5.3.0`
- `secure_firewall_threat_defense = 5.4.0`
- `secure_firewall_threat_defense = 6.0.0`
- `secure_firewall_threat_defense = 6.0.1`
- `secure_firewall_threat_defense = 6.0.1.3`
- `secure_firewall_threat_defense = 6.1.0`
- `secure_firewall_threat_defense = 6.1.0.2`
- `secure_firewall_threat_defense = 6.2.0`
- `secure_firewall_threat_defense = 6.2.1`
- `secure_firewall_threat_defense = 6.2.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.