CVE-2025-20333 KEV
9.9
CRITICAL · CVSS 3.1 · EPSS 70.7% (pctl 99)
Patch first
On CISA KEV — known exploited in the wild, due 2025-09-26.
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.
Scoring
| CVSS | 9.9 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| EPSS | 70.65% — more likely to be exploited than 99% of all CVEs |
| Weakness | CWE-120 |
| On CISA KEV | yes — remediate by 2025-09-26 |
| Public exploit | none known |
| Published | 2025-09-25 |
| Last modified | 2026-08-11 |
CISA KEV
| Name | Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability |
|---|---|
| Added | 2025-09-25 |
| Due | 2025-09-26 |
| Vendor / product | Cisco / Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense |
| Ransomware use | none reported |
Affected (2)
| Vendor | Product |
|---|---|
| cisco | adaptive security appliance software |
| cisco | secure firewall threat defense |
References
→ the Explorer · watch your stack · NVD