CVE-2020-3580
Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Interface Cross-Site Scripting Vulnerabilities
Cisco ASA and FTD Cross-Site Scripting (XSS) Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply updates per vendor instructions.
CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2020-3580
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.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NExploitation Context
as of October 14, 2026- CISA added CVE-2020-3580 to the KEV catalog 378 days after its CVE record was published.
- It is one of 100 Cisco entries in the CISA KEV catalog, and one of 11 added in 2021.
- Its current EPSS score (85.6%) is higher than that of 68% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Cisco | Cisco Cisco Adaptive Security Appliance (ASA) Software | n/a |
References
1 LinksRecord Details
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Tool categories
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