Memory leak in Cisco Secure Firewall Threat Defense (FTD) and Cisco Adaptive Security Appliance (ASA) - CVE-2026-20222
Published: September 17, 2026
Vulnerability identifier: #VU150755
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-20222
CWE-ID: CWE-401
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper resource management in the EIGRP implementation when handling EIGRP update messages. A remote attacker can send crafted EIGRP updates at a high rate to trigger a memory leak and cause a denial of service.
Only devices with EIGRP enabled are affected.
Affected software
Cisco Secure Firewall Threat Defense (FTD)
Cisco Adaptive Security Appliance (ASA)
Cisco Adaptive Security Appliance (ASA)
How to mitigate CVE-2026-20222
Install security update from vendor's website.
Cisco Secure Firewall Threat Defense (FTD) - addressed in versions 7.4.8, 7.6.6, 7.7.13, 10.0.2
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.20.4.49, 9.22.3.26, 9.23.1.47, 9.24.1.26
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.20.4.49, 9.22.3.26, 9.23.1.47, 9.24.1.26