CVE-2026-20016
Command Injection in Cisco FXOS CLI Allows Root Execution
Publication date: 2026-03-04
Last updated on: 2026-03-04
Assigner: Cisco Systems, Inc.
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| cisco | secure_firewall_asa_software | * |
| cisco | secure_ftd_software | * |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-88 | The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in the Cisco FXOS Software CLI feature used by Cisco Secure Firewall ASA Software and Secure FTD Software. It allows an authenticated local attacker, who already has valid administrative credentials, to execute arbitrary commands on the underlying operating system with root-level privileges.
The root cause is insufficient input validation of user-supplied command arguments. By submitting specially crafted input to certain CLI commands, an attacker can exploit this flaw to run commands with the highest level of system access.
How can this vulnerability impact me? :
If exploited, this vulnerability can allow an attacker with administrative access to gain root-level control over the affected device's operating system. This means the attacker could execute any command, potentially leading to unauthorized system changes, data compromise, or disruption of services.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know