CVE-2019-25417 in Comodo Dome Firewall
Summary
by MITRE • 02/19/2026
Comodo Dome Firewall 2.7.0 contains a reflected cross-site scripting vulnerability that allows attackers to inject malicious scripts by submitting crafted input to the protocol parameter. Attackers can send POST requests to the QoS rules management endpoint with JavaScript payloads in the protocol parameter to execute arbitrary code in administrator browsers.
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Analysis
by VulDB Data Team • 02/19/2026
The vulnerability identified as CVE-2019-25417 affects Comodo Dome Firewall version 2.7.0 and represents a critical reflected cross-site scripting flaw that poses significant security risks to network administrators and system operators. This vulnerability resides within the firewall's web interface management system, specifically targeting the Quality of Service rules management endpoint. The flaw enables attackers to inject malicious JavaScript code through a crafted POST request that includes malicious payloads in the protocol parameter, effectively bypassing standard input validation mechanisms that should protect against such attacks.
The technical implementation of this vulnerability stems from improper input sanitization within the web application layer of the firewall software. When the application processes the protocol parameter without adequate validation or encoding, it fails to distinguish between legitimate user input and malicious script code. This creates a reflected XSS vector where attacker-controlled content is immediately reflected back to the victim's browser without proper sanitization. The vulnerability specifically impacts the QoS rules management functionality, which is commonly accessed by administrators with elevated privileges, making the potential attack surface particularly dangerous.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the capability to perform administrative actions on behalf of privileged users. When administrators interact with the compromised firewall interface, the malicious JavaScript payloads can execute arbitrary code within their browser context, potentially leading to complete system compromise. Attackers can leverage this vulnerability to establish persistent access, steal administrative credentials, modify firewall rules, or redirect traffic to malicious destinations. The reflected nature of the vulnerability means that successful exploitation requires user interaction with a specially crafted malicious link or form submission, but the attack can be automated through social engineering techniques.
Security professionals should recognize this vulnerability as a direct violation of CWE-79, which defines Cross-Site Scripting vulnerabilities where applications fail to properly sanitize user input. The attack vector aligns with ATT&CK technique T1059.007, specifically focusing on JavaScript and VBScript execution through web interfaces. Additionally, this vulnerability demonstrates poor input validation practices that could enable broader exploitation patterns including session hijacking and privilege escalation attacks. Organizations utilizing Comodo Dome Firewall should prioritize immediate remediation through official patches provided by the vendor, while implementing network segmentation and monitoring to detect potential exploitation attempts. The vulnerability also highlights the importance of regular security assessments and input validation reviews to prevent similar issues in other network security appliances and web applications.