Improper Certificate Validation in Cisco Secure Firewall Threat Defense (FTD) and Cisco Secure Firewall Management Center (formerly Firepower Management Center, FMC) - CVE-2026-20323
Published: September 17, 2026
Vulnerability identifier: #VU150677
CSH Severity: Medium
CVSS v4: 7.7 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20323
CWE-ID: CWE-295
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to improper management of the TLS certificate for the sftunnel management connection. A remote attacker on the local network can become a registered sftunnel peer with root access.
Affected software
Cisco Secure Firewall Threat Defense (FTD)
Cisco Secure Firewall Management Center (formerly Firepower Management Center, FMC)
Cisco Secure Firewall Management Center (formerly Firepower Management Center, FMC)
How to mitigate CVE-2026-20323
Install updates from vendor's website.
Cisco Secure Firewall Threat Defense (FTD) - addressed in versions 7.2.12, 7.4.8, 7.6.6, 7.7.13, 10.0.2
Cisco Secure Firewall Management Center (formerly Firepower Management Center, FMC) - addressed in versions 7.2.12, 7.4.8, 7.6.6, 7.7.13, 10.0.2
Cisco Secure Firewall Management Center (formerly Firepower Management Center, FMC) - addressed in versions 7.2.12, 7.4.8, 7.6.6, 7.7.13, 10.0.2