CVE-2025-20333
CRITICALCVSS v3
9.9
CRITICAL
EPSS Score
16.6%
exploit probability
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
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.
Technical Details
- Published
- 9/25/2025
Frequently Asked Questions
What is CVE-2025-20333?
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.
Is CVE-2025-20333 actively exploited?
Active exploitation of CVE-2025-20333 has not been confirmed. The EPSS score is 16.6%, indicating the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2025-20333?
CVE-2025-20333 has a CVSS v3 base score of 9.9 (CRITICAL severity).
Is CVE-2025-20333 affecting your environment?
Use isMalicious to check if any of your IPs or domains are associated with this vulnerability's IOCs.