Missing Authentication for Critical Function in Cisco Secure Firewall Management Center (formerly Firepower Management Center, FMC) - CVE-2026-20343
Published: September 17, 2026
Vulnerability identifier: #VU150670
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20343
CWE-ID: CWE-306
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to the critical API lacks authentication. A remote attacker can download sensitive files that should be restricted and consume disk space to perform a denial of service (DoS) attack.
Affected software
Cisco Secure Firewall Management Center (formerly Firepower Management Center, FMC)
How to mitigate CVE-2026-20343
Install updates from vendor's website.
Cisco Secure Firewall Management Center (formerly Firepower Management Center, FMC) - addressed in versions 7.6.6, 7.7.13