CVE-2019-25422 in Comodo Dome Firewall
Summary
by MITRE • 02/19/2026
Comodo Dome Firewall 2.7.0 contains cross-site scripting vulnerabilities that allow attackers to inject malicious scripts through the vpnfw endpoint. Attackers can submit POST requests with script payloads in the target parameter for reflected XSS or the remark parameter for stored XSS to execute arbitrary JavaScript in administrator browsers.
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Analysis
by VulDB Data Team • 02/22/2026
Comodo Dome Firewall version 2.7.0 contains critical cross-site scripting vulnerabilities that represent significant security risks for organizations relying on this network protection solution. These vulnerabilities exist within the vpnfw endpoint and affect the firewall's ability to properly sanitize user input, creating opportunities for attackers to execute malicious code within the context of administrator sessions. The flaw manifests through two distinct attack vectors that demonstrate the severity of the issue and the potential for widespread impact across network security infrastructure. The vulnerability specifically affects the handling of parameters within POST requests submitted to the vpnfw endpoint, where the target parameter enables reflected cross-site scripting attacks and the remark parameter facilitates stored cross-site scripting exploits.
The technical implementation of these vulnerabilities stems from insufficient input validation and output encoding within the firewall's web interface components. When administrators interact with the vpnfw endpoint, the application fails to properly sanitize or escape user-supplied data before rendering it in web responses. This inadequate sanitization process creates persistent XSS vulnerabilities that can be exploited across different session contexts, with reflected attacks executing immediately upon page load and stored attacks persisting in the application's database or storage mechanisms. The vulnerability affects both authenticated and unauthenticated attack scenarios, though the most dangerous exploits require administrative privileges to maximize impact. The flaw operates at the application layer and demonstrates poor security engineering practices in input handling and data validation mechanisms. This vulnerability directly maps to CWE-79 which defines cross-site scripting as a weakness where applications fail to properly escape or validate user input before rendering it in web contexts, and aligns with ATT&CK technique T1566.001 which describes social engineering through malicious web content.
The operational impact of these vulnerabilities extends beyond simple script execution to potentially compromise entire network security infrastructures. Attackers who successfully exploit these XSS vulnerabilities can gain elevated privileges within the firewall management interface, potentially allowing them to modify firewall rules, disable security features, or redirect network traffic to malicious endpoints. The stored XSS capability through the remark parameter means that malicious payloads can persist for extended periods, making detection more difficult and allowing attackers to maintain access even after initial compromise. Administrative sessions are particularly vulnerable since the attacks can execute within the context of privileged users, potentially enabling complete takeover of the firewall configuration. Organizations using Comodo Dome Firewall 2.7.0 face risks including unauthorized network access, data exfiltration, and disruption of security controls that protect against other attack vectors. The vulnerability also creates opportunities for attackers to establish persistent backdoors through malicious scripts that can monitor administrator activities and capture sensitive authentication information.
Mitigation strategies for this vulnerability should prioritize immediate patching of the Comodo Dome Firewall software to the latest available version that addresses these XSS flaws. Organizations should implement network segmentation and access controls to limit exposure of the firewall management interface to trusted networks only, while also deploying web application firewalls to monitor and filter malicious requests. Input validation controls should be strengthened at the application level to ensure all user-supplied data is properly sanitized before processing, and output encoding should be implemented to prevent script execution in web responses. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other network security components, while security monitoring systems should be configured to detect anomalous patterns in firewall management activities. Network administrators should also implement multi-factor authentication for all administrative access points and regularly review firewall logs for signs of exploitation attempts. The vulnerability underscores the importance of maintaining up-to-date security patches and implementing defense-in-depth strategies that reduce the attack surface of critical network infrastructure components. Organizations should also consider implementing automated vulnerability scanning tools that can identify similar XSS vulnerabilities across their entire network security ecosystem.