Actively exploited in the wild
Cisco ASA and FTD Cross-Site Scripting (XSS) Vulnerability
Cisco - Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) · Listed in the CISA KEV since 2021-11-03. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2020-3580
MediumCVSS 6.1KEVExploitation Probability (EPSS)
Very high risk100th percentile - higher than 100% of all known CVEs
Summary
Multiple vulnerabilities in the web services interface of Cisco ASA and FTD Software allow an unauthenticated, remote attacker to conduct XSS attacks against users of the interface. The issues are due to insufficient validation of user-supplied input. A successful exploit could allow arbitrary script execution in the interface context or access to sensitive browser-based information.
Risk Assessment
Risk of user data theft or session hijacking in the web interface, potentially leading to confidentiality and integrity breaches.
Recommendation
Apply Cisco updates and educate users about the risk of clicking suspicious links.
Original NVD description (English source)
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.