Cisco · Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
CVE-2020-3580
Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Interface Cross-Site Scripting Vulnerabilities
What it is
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.
CISA: 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.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: May 3, 2022
More exploited flaws from Cisco
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Oct 24, 2024 | ASA and FTD Denial-of-Service | Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) | Medium 5.8 | 16% |
| Apr 24, 2024 | ASA and FTD Denial of Service | Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) | High 8.6 | 70% |
| Apr 24, 2024 | ASA and FTD Privilege Escalation | Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) | Medium 6.0 | 19% |
| Feb 15, 2024 | ASA and FTD Information Disclosure | Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) | High 7.5 | 72% |
| Nov 3, 2021 | ASA and FTD Read-Only Path Traversal | Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) | High 7.5 | >99.9% |
| Oct 14, 2026 | Relative Path Traversal | Secure Email Gateway | Critical 9.8 | 2.2% |
| Sep 30, 2026 | Hex Encoding | Catalyst SD-WAN Manager | Critical 9.8 | 39% |
| Sep 16, 2026 | Incorrect Use of Privileged APIs | Identity Services Engine | Critical 10.0 | 76% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.