CVE-2026-76412: Cisco Secure Firewall Management Center Software Authenticated Privilege Escalation to Root Vulnerability
A vulnerability in the remote diagnostics debugger of Cisco Secure FMC Software could allow an authenticated, remote attacker to enable the remote diagnostics debugger service. This vulnerability is due to an error when checking the privilege level of a user who is invoking remote diagnostics. An attacker could exploit this vulnerability by authenticating to the device, either through the web-based management interface or the REST API, and using the remote diagnostics debugger to grant a user elevated privileges. A successful exploit could allow the attacker to elevate privileges to root. Notes: To exploit this vulnerability, the attacker must have valid user credentials on the affected device. The CVSSv3.1 Attack Complexity is High due to the multistage process required to fully exploit this vulnerability.
Affected Software
Event History
Frequently Asked Questions
Who is exposed to exploitation?
Only attackers with valid user credentials on an affected device can exploit this issue. They can authenticate through either the web-based management interface or the REST API.
What does an attacker need to do to gain root privileges?
The attacker must use the remote diagnostics functionality to enable the remote diagnostics debugger service, then use that debugger to grant a user elevated privileges. The full exploitation process is multistage, which is reflected in the High attack complexity rating.
Can this be exploited without logging in?
No. Valid credentials for the affected device are required, and the vulnerability has a low privileges required rating because an authenticated user can trigger the affected privilege check.