CVE-2020-3166

Cisco FXOS Software CLI Arbitrary File Read and Write Vulnerability

MEDIUM

6.7

CVSS Score

Published: February 26, 2020 at 04:51 PM UTC

Updated: August 11, 2026 at 07:33 PM UTC

19 products affected across 1 vendorAdaptive Security ApplianceSecure Firewall Threat DefenseFirepower Extensible Operating System

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Severity

MEDIUM6.7

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Adaptive Security Appliance · Cisco

95%

9.10 ≤ v < 9.13.1.59.8 ≤ v < 9.9.2.66

Affected range stops below 9.13.1.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.9.2.66, so it looks safe — our inference, not a vendor statement

cisco-firepower-1010 (environment) · cisco-firepower-1120 (environment) · cisco-firepower-1140 (environment) · cisco-firepower-1150 (environment) · cisco-firepower-2110 (environment) · cisco-firepower-2120 (environment) · cisco-firepower-2130 (environment) · cisco-firepower-2140 (environment)

Firepower Extensible Operating System · Cisco

95%

v < 2.2.2.972.3 ≤ v < 2.3.1.1552.4 ≤ v < 2.4.1.2382.6 ≤ v < 2.6.1.157

Affected range stops below 2.2.2.97, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.3.1.155, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.4.1.238, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.6.1.157, so it looks safe — our inference, not a vendor statement

cisco-firepower-4110 (environment) · cisco-firepower-4115 (environment) · cisco-firepower-4120 (environment) · cisco-firepower-4125 (environment) · cisco-firepower-4140 (environment) · cisco-firepower-4145 (environment) · cisco-firepower-4150 (environment) · cisco-firepower-9300 (environment)

Secure Firewall Threat Defense · Cisco

95%

6.2.2 ≤ v < 6.2.3.166.3.0 ≤ v < 6.5.0.3

Firepower 1010 · Ciscodevice

80%

All versions

Firepower 1120 · Ciscodevice

80%

All versions

Firepower 1140 · Ciscodevice

80%

All versions