CVE-2025-20333
CVSS v3
9.9
CRITICAL
EPSS Score
16.6 %
exploit probability
CISA KEV
Yes
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.
CISA Known Exploited Vulnerability
- Date Added
- 2025-09-25
- Patch Due Date
- 2025-09-26
- Ransomware Use
- Unknown
Technical details
- Published
- 2025-09-25
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?
Yes. CVE-2025-20333 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 9/26/2025.
What is the CVSS score for CVE-2025-20333?
CVE-2025-20333 has a CVSS v3 base score of 9.9 (CRITICAL severity).
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