CVE-2026-20017 Cisco Secure FTD Software Authenticated Command Injection Vulnerability
An authenticated local attacker with admin credentials can execute arbitrary root commands on Cisco Secure FTD devices via CLI input validation flaws.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20017?
CVE-2026-20017 is a medium-severity command injection vulnerability in Cisco Secure Firewall Threat Defense, published on 4 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability in the CLI of Cisco Secure FTD Software could allow an authenticated, local attacker to execute arbitrary commands on the underlying operating system as root. To exploit this vulnerability, the attacker must have valid administrative credentials on an affected device. This vulnerability is due to insufficient input validation of user-supplied command arguments. An attacker could exploit this vulnerability by submitting crafted input for a specific CLI command. A successful exploit could allow the attacker to execute commands on the underlying operating system as root.
Weakness: CWE-250
Which versions are affected by CVE-2026-20017?
It affects 1 product.
Products include Cisco Secure Firewall Threat Defense.
How do I fix CVE-2026-20017?
No fix has been published for CVE-2026-20017 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-20017 being exploited?
There is no known exploitation of CVE-2026-20017 in the wild and no public exploit code.
Other vulnerabilities in Cisco Secure Firewall Threat Defense
- CVE-2024-20412 Hardcoded credentials in Cisco Firepower Threat Defense Software
- CVE-2024-20330 Memory corruption in Cisco Firepower Threat Defense Software
- CVE-2024-20339 Cisco Firepower Threat Defense Software for Firepower 2100 Series TLS Denial of Service Vulnerability
- CVE-2024-20351 Cisco Firepower Threat Defense Software Snort Firewall Denial of Service Vulnerability
- CVE-2023-20083 Denial of service in Cisco Firepower Threat Defense Software
Sources
Also known as GHSA-4j6q-qq58-w4v4.