CVE-2026-76412: high-severity vulnerability in Cisco Secure Firewall Management Center (FMC)
Cisco Secure Firewall Management Center Software Authenticated Privilege Escalation to Root Vulnerability
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.5epss 0.4%
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.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
Cisco · Cisco Secure Firewall Management Center (FMC)Related CVEs — Cisco Secure Firewall Management Center (FMC)
In the same product, most dangerous first.
CVE-2026-20079CRITICALCisco Secure Firewall Management Center Authentication Bypass Remote Code Execution VulnerabilityEPSS 88.7%KEVCVE-2026-20131CRITICALCisco Secure Firewall Management Center Software Remote Code Execution VulnerabilityEPSS 44.4%KEVCVE-2026-20316MEDIUMCisco Secure Firewall Management Center Software Static Credential VulnerabilityEPSS 35.1%KEVCVE-2026-20242CRITICALCisco Secure Firewall Management Center Software Java Deserialization Remote Code Execution VulnerabilityEPSS 0.9%CVE-2026-20340HIGHCisco Secure Firewall Management Center Software Deserialization Arbitrary Root Command Execution VulnerabilityEPSS 0.7%CVE-2026-20343HIGHCisco Secure Firewall Management Center Software Information Disclosure and Disk Denial of Service VulnerabilityEPSS 0.7%