Buffer overflow in Cisco Adaptive Security Appliance (ASA) and Cisco Firewall Threat Defense (FTD) - CVE-2025-20222

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Main Vulnerability Database Vulnerabilities #VU114091

Buffer overflow in Cisco Adaptive Security Appliance (ASA) and Cisco Firewall Threat Defense (FTD) - CVE-2025-20222

Published: August 14, 2025


Vulnerability identifier: #VU114091
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-20222
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Cisco Systems, Inc
Affected software:
Cisco Adaptive Security Appliance (ASA)
Cisco Firewall Threat Defense (FTD)

Detailed vulnerability description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error within the RADIUS proxy feature for IPsec VPN when processing IPv6 packets. A remote attacker can pass specially crafted packets to the system, trigger memory corruption and perform a denial of service (DoS) attack.


How to mitigate CVE-2025-20222

Install updates from vendor's website.

Sources