November 3, 2021 · Applied Cybernetics Group
CVE-2020-3580 — Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
known ransomware use
Cisco ASA and FTD Cross-Site Scripting (XSS) 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
- 99.7th percentile (score 0.856, as of
2026-09-16) - NVD CVSS v3.1
- 6.1 (MEDIUM)
- Ransomware use
- Known
- ATT&CK
- T1059 , T1204.001 , T1217 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2020-3580
CISA short description
Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an insufficient input validation vulnerability for user-supplied input by the web services interface. Successful exploitation could allow an attacker to perform cross-site scripting (XSS) in the context of the interface or access sensitive browser-based information.
Required action
Apply updates per vendor instructions.
NVD description
Multiple vulnerabilities in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct cross-site scripting (XSS) attacks against a user of the web services interface of an affected device. The vulnerabilities are due to insufficient validation of user-supplied input by the web services interface of an affected device. An attacker could exploit these vulnerabilities by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or allow the attacker to access sensitive, browser-based information. Note: These vulnerabilities affect only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section.