CVE-2020-3580 — Cisco ASA and FTD Cross-Site Scripting (XSS) Vulnerability

CVE-2020-3580 (Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)) is in the CISA Known Exploited Vulnerabilities catalog since 2021-11-03. Used in ransomware. Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an insufficient input… See the…

Exploitation status

CVE-2020-3580 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 2021-11-03. 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.

Advisory facts

Vendor or project
Cisco
Affected product
Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
Added to CISA KEV
2021-11-03
US federal remediation due date
2022-05-03
Ransomware association
Known
EPSS score
—
Weakness (CWE)
CWE-79

Remediation: the required action

Apply updates per vendor instructions.

Wording published by CISA for this catalog entry. It is the baseline action, not a decision about your environment: whether this exposure matters for you depends on where the affected component runs, what it is exposed to and who owns it.

From advisory to a decision you can defend

A catalog entry tells you a vulnerability is being exploited somewhere. It does not tell you whether it matters in your estate, who owns the fix, or what evidence an auditor will ask for later. That is the work VulnTrek does: it takes findings from the tools you already run, decides which exposure actually matters, routes it to an owner, keeps remediation human-approved and retains the lineage as evidence.

Sourced from public upstream advisories (CISA KEV, ENISA EUVD, vendor PSIRTs) mirrored daily. Informational only — not a remediation decision, not legal advice, and the absence of a record is not evidence of safety.