CVE-2026-20324: Cisco Secure Firewall Management Center sftunnel Root Arbitrary Code Exectution Vulnerability
A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure Firewall Management Center (FMC) Software could allow an authenticated, remote attacker to execute arbitrary commands as root. This vulnerability exists because a registered sftunnel peer has incorrect permissions to write an arbitrary file to any location on the device. An attacker could exploit this vulnerability by hijacking the sftunnel communication connection or being a valid registered sftunnel peer and sending an sftunnel command to write a malicious file to the disk of an affected device. A successful exploit could allow the attacker to write a file to the device that is executed with root privileges. To exploit this vulnerability, the attacker must have valid user credentials on the affected device.
Affected Software
Event History
Frequently Asked Questions
What level of access does an attacker need to exploit this issue?
The attacker must have valid user credentials on the affected device. Exploitation also involves either hijacking an sftunnel communication connection or acting as a valid registered sftunnel peer.
What capability does successful exploitation provide?
A successful attacker can write a malicious file to the affected device that is then executed with root privileges. This enables arbitrary command execution as root.