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6.1

Cisco Firewall Software: Attackers can hijack VPN user's browser

CVE-2026-20070
Summary

Cisco Firewall Software has a flaw that lets hackers trick users into visiting malicious websites, potentially allowing them to steal sensitive information or take control of the user's browser. This affects users of Cisco Secure Firewall Adaptive Security Appliance (ASA) and Cisco Secure Firewall Threat Defense (FTD) Software. To stay safe, ensure users are cautious when clicking on links and keep software up to date.

Original title
A vulnerability in the VPN web services component of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthen...
Original description
A vulnerability in the VPN web services component of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a browser that is accessing an affected device. 

This vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by persuading a user to follow a link to a malicious website that is designed to submit malicious input to the affected application. A successful exploit could allow the attacker to execute arbitrary HTML or script code in the browser in the context of the VPN web server.
nvd CVSS3.1 6.1
Vulnerability type
CWE-80 Basic XSS
Published: 4 Mar 2026 · Updated: 13 Mar 2026 · First seen: 6 Mar 2026