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.
Is CVE-2026-20079 exploited?
Listed in the CISA KEV catalog on 2026-09-09.
Federal remediation due 2026-09-12.
Past that date by 19 days.
EPSS puts exploitation in the next 30 days at 88%.
Public exploit code: packaged in a public tool.
Public detection rules exist.
Which products and versions are affected?
No affected package list recorded here yet.
Is there a patch?
No patch identifier recorded here yet.
What PlainSec published about CVE-2026-20079
PlainSec has not published a story about this CVE.