November 3, 2021 · Applied Cybernetics Group
CVE-2020-3452 — Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
Cisco ASA and FTD Read-Only Path Traversal Vulnerability
- Added to KEV
2021-11-03- Federal due date
2022-05-03- Vendor
- Cisco
- Product
- Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
- EPSS
- 100.0th percentile (score 1.000, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- ATT&CK
- T1005 , T1202 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2020-3452
CISA short description
Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an improper input validation vulnerability when HTTP requests process URLs. An attacker could exploit this vulnerability by sending a crafted HTTP request containing directory traversal character sequences to an affected device. A successful exploit could allow the attacker to view arbitrary files within the web services file system on the targeted device.
Required action
Apply updates per vendor instructions.