CVE-2026-20079
Cisco Secure Firewall Management Center Authentication Bypass Remote Code Execution Vulnerability
Description
A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to bypass authentication and execute script files on an affected device to obtain root access to the underlying operating system. This vulnerability is due to an improper system process that is created at boot time. An attacker could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute a variety of scripts and commands that allow root access to the device.
Weakness: CWE-288
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco Secure Firewall Management Center Check your version | Network & Security Management | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco Secure Firewall Management Center (FMC)
Vendor advisory
cisco-sa-onprem-fmc-authbypass-5JPp45V2
Cisco Secure Firewall Management Center Software Authentication Bypass Vulnerability
Cisco’s rating: Critical (advisory CVSS 10.0) · Published Mar 4, 2026 · updated Sep 16, 2026 (revision 2.6)
Bug IDs: CSCwr96008 , CSCwt95974
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from