CVE-2025-20333

high-risk
Published 2025-09-25

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.

Do I need to act?

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10.6% chance of exploitation in next 30 days
EPSS score — higher than 89% of all CVEs
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CISA KEV: actively exploited in the wild
On the Known Exploited Vulnerabilities catalog — federal agencies must patch
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.9/10 Critical
NETWORK / LOW complexity

Affected Products (3)

Affected Vendors

Cisco

References (3)

Vendor Advisory https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/ci...
Vendor Advisory https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_atta...
US Government Resource https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-...
60
/ 100
high-risk
Severity 33/34 · Critical
Exploitability 18/34 · Moderate
Exposure 9/34 · Low