---
id: CVE-2019-1978
title: >-
  A vulnerability in the stream reassembly component of Cisco Firepower Threat
  Defense Software, Cisco FirePOWER Services Software for ASA, and Cisco
  Firepower Management Center Software could allow an unauthenticated, remote
  attacker to b…
summary: >-
  A vulnerability in the stream reassembly component of Cisco Firepower Threat
  Defense Software, Cisco FirePOWER Services Software for ASA, and Cisco
  Firepower Management Center Software could allow an unauthenticated, remote
  attacker to b…
severity: medium
cvss: 5.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N'
cwe:
  - CWE-264
  - CWE-20
vendor: cisco
product: firepower_services_software_for_asa
affected:
  - firepower_services_software_for_asa
  - 'secure_firewall_management_center >= 2.9.12, <= 2.9.12.15'
  - 'secure_firewall_management_center >= 2.9.13, <= 2.9.13.6'
  - 'secure_firewall_management_center >= 2.9.14.0, <= 2.9.14.5'
  - secure_firewall_management_center = 2.9.15
  - secure_firewall_management_center = 2.9.16
  - secure_firewall_threat_defense
published: '2019-11-05'
updated: '2026-08-11'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2019-1978'
references:
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190816-ftd-srb
    label: psirt@cisco.com
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190816-ftd-srb
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - exploit-available
epss: 0.09382
epssPercentile: 0.95231
exploitAvailable: true
ingestedAt: '2026-08-11T19:48:27.176Z'
exploits:
  exploitdb: true
  checkedAt: '2026-09-21T15:23:42.704Z'
---

## Overview

A vulnerability in the stream reassembly component of Cisco Firepower Threat Defense Software, Cisco FirePOWER Services Software for ASA, and Cisco Firepower Management Center Software could allow an unauthenticated, remote attacker to bypass filtering protections. The vulnerability is due to improper reassembly of traffic streams. An attacker could exploit this vulnerability by sending crafted streams through an affected device. An exploit could allow the attacker to bypass filtering and deliver malicious requests to protected systems that would otherwise be blocked.

## Affected

- `firepower_services_software_for_asa`
- `secure_firewall_management_center >= 2.9.12, <= 2.9.12.15`
- `secure_firewall_management_center >= 2.9.13, <= 2.9.13.6`
- `secure_firewall_management_center >= 2.9.14.0, <= 2.9.14.5`
- `secure_firewall_management_center = 2.9.15`
- `secure_firewall_management_center = 2.9.16`
- `secure_firewall_threat_defense`

## Remediation

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