CVE-2025-20333: Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability
A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of the affected device.
Other sources
Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software VPN Web Server contain a buffer overflow vulnerability that allows for remote code execution. This vulnerability could be chained with CVE-2025-20362.
— CISA
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-20333?
CVE-2025-20333 has been assigned a high severity rating due to its potential for remote code execution.
How do I fix CVE-2025-20333?
To fix CVE-2025-20333, update the Cisco Secure Firewall ASA or FTD software to the latest patched version.
What systems are affected by CVE-2025-20333?
CVE-2025-20333 affects Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software.
Can CVE-2025-20333 be exploited remotely?
Yes, CVE-2025-20333 can be exploited by an authenticated remote attacker.
What type of vulnerability is CVE-2025-20333?
CVE-2025-20333 is a code execution vulnerability in the VPN web server of affected Cisco devices.