- Critical 10.0
- Known exploited (CISA KEV)
CVE-2026-20079
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.…
Scores
The facts
- Published
- 4 March 2026
- Last changed
- 16 September 2026
- NVD status
- Analyzed
- Severity
- Critical, CVSS 10.0 out of 10 (version 3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - Weakness
- Affects
- cisco secure firewall management center
- Known exploited
- Yes. CISA added it to the Known Exploited Vulnerabilities catalogue on 9 September 2026.
- EPSS
- 88.2% chance of exploitation activity in the next 30 days (percentile 100).
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