CVE-2020-3166: Cisco Adaptive Security Appliance Software

Medium severity, CVSS 6.7. EPSS: 0.3% chance of exploitation in the next 30 days.

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 products

• Cisco Adaptive Security Appliance Software: from 9.8, before 9.9.2.66 (fixed in 9.9.2.66); from 9.10, before 9.13.1.5 (fixed in 9.13.1.5)
• Cisco Firepower Extensible Operating System: before 2.2.2.97 (fixed in 2.2.2.97); from 2.3, before 2.3.1.155 (fixed in 2.3.1.155); from 2.4, before 2.4.1.238 (fixed in 2.4.1.238); from 2.6, before 2.6.1.157 (fixed in 2.6.1.157)
• Cisco Secure Firewall Threat Defense: from 6.2.2, before 6.2.3.16 (fixed in 6.2.3.16); from 6.3.0, before 6.5.0.3 (fixed in 6.5.0.3)

Published 2020-02-26. Last modified 2026-08-11.