CVE-2020-3580
Cisco ASA and FTD Cross-Site Scripting (XSS) Vulnerability
Cisco · Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
Vulnerability details
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.
Added to CISA KEV: 2021-11-03
Ransomware campaign use: Known
CISA due date: 2022-05-03
Defensive guidance from CISA
Apply updates per vendor instructions.
This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.
Source catalog date: 2026-11-06T19:44:45.1797Z · Last retrieved: 2026-11-06 21:02:26 UTC