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9.1

Cisco Secure FMC allows admin attacker to gain full control

CVE-2026-20341 · published 26 days ago
Summary

Someone who already has an admin login to Cisco Secure Firewall Management Center can send specially crafted messages and take complete control of the management server and its backup partner. This gives them the highest level of system access, letting them change settings or view data at will. Install Cisco’s latest security update and restrict admin access to trusted users only.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
cisco cisco secure firewall management center (fmc) 7.0.0
Original advisory text
Cisco Secure Firewall Management Center Software sftunnel Deserialization Root Command Execution Vulnerability
A vulnerability in the sftunnel inter-device communication protocol of Cisco Secure FMC Software could allow an authenticated, remote attacker to obtain root privileges.

This vulnerability is due to unsecured deserialization of untrusted data over the sftunnel management connection. An attacker could exploit this vulnerability by sending crafted sftunnel remote procedure calls (RPCs). A successful exploit could allow the attacker to gain root privileges on a device that is running Cisco Secure FMC Software and its high-availability peer.
To exploit this vulnerability, the attacker must have valid administrative credentials on a managed Cisco FTD device.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.1 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-502Deserialization of Untrusted Data
Timeline
Published16 Sep 2026
Updated11 Oct 2026
First seen16 Sep 2026
Sources
CVE-2026-20341 · NVD
CVE-2026-20341 · MITRE
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