#VU116119 Buffer overflow in Cisco Adaptive Security Appliance (ASA) and Cisco Firewall Threat Defense (FTD) - CVE-2025-20333
Published: September 25, 2025 / Updated: April 1, 2026
Vulnerability identifier: #VU116119
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/U:Amber
CVE-ID: CVE-2025-20333
CWE-ID: CWE-120
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerable software:
Cisco Adaptive Security Appliance (ASA)
Cisco Firewall Threat Defense (FTD)
Cisco Adaptive Security Appliance (ASA)
Cisco Firewall Threat Defense (FTD)
Software vendor:
Cisco Systems, Inc
Cisco Systems, Inc
Description
The vulnerability allows a remote user to compromise the affected system.
The vulnerability exists due to a boundary error within the VPN Web Server when handling HTTP requests. A remote authenticated VPN user can send specially crafted HTTP requests to the affected device, trigger a buffer overflow and execute arbitrary code with root privileges.
Remediation
Install updates from vendor's website.