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6.7Medium

Cisco Secure Firewall Threat Defense

CVE-2020-3166

A vulnerability in the CLI of Cisco FXOS Software could allow an authenticated, local attacker to read or write arbitrary files on the underlying operating system (OS). The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by including crafted arguments to a specific CLI command. A successful exploit could allow the attacker to read or write to arbitrary files on the underlying OS.

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 only with access to the machine itself, with an administrator login, and without anyone at your company clicking anything.

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.

Check if you’re exposedBook a call

Scoring

CVSS
6.7 (v3.1)
Vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-20
Assigned by
psirt@cisco.com

Dates

Published
2020-02-26
Last modified
2026-08-11
Sources
NVD

Affected products

  • Cisco Secure Firewall Threat Defense6.2.2 - 6.2.3.16, 6.3.0 - 6.5.0.3
  • Cisco Adaptive Security Appliance Software9.8 - 9.9.2.66, 9.10 - 9.13.1.5
  • Cisco Firepower 1010all versions
  • Cisco Firepower 1120all versions
  • Cisco Firepower 1140all versions
  • Cisco Firepower 1150all versions
  • Cisco Firepower 2110all versions
  • Cisco Firepower 2120all versions
  • Cisco Firepower 2130all versions
  • Cisco Firepower 2140all versions
  • Cisco Firepower Extensible Operating System- 2.2.2.97, 2.3 - 2.3.1.155, 2.4 - 2.4.1.238, 2.6 - 2.6.1.157
  • Cisco Firepower 4110all versions

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

References