CVE-2014-0331 in FortiADC
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the web administration interface in FortiADC with firmware before 3.2.1 allows remote attackers to inject arbitrary web script or HTML via the locale parameter to gui_partA/.
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Analysis
by VulDB Data Team • 05/10/2026
The vulnerability identified as CVE-2014-0331 represents a critical cross-site scripting flaw within the web administration interface of FortiADC appliances. This weakness exists in firmware versions prior to 3.2.1 and specifically targets the locale parameter handling within the gui_partA/ endpoint. The flaw enables remote attackers to execute malicious web scripts or HTML code within the context of authenticated user sessions, potentially compromising the security of administrative interfaces. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is classified as a critical weakness in web application security. The ATT&CK framework categorizes this as a technique for code injection within the web application attack surface, specifically targeting the administrative user interface.
The technical exploitation of this vulnerability occurs through manipulation of the locale parameter in the gui_partA/ URL endpoint. When an attacker crafts a malicious request containing script code within this parameter, the application fails to properly sanitize or escape the input before rendering it in the web interface. This allows the injected payload to execute in the browser context of any user who accesses the affected interface, particularly administrative users who maintain elevated privileges. The vulnerability is particularly dangerous because it operates within the administrative web console, meaning that successful exploitation could provide attackers with full control over the FortiADC appliance configuration, potentially leading to complete system compromise. The flaw demonstrates poor input validation and output encoding practices that are fundamental to preventing XSS attacks.
The operational impact of this vulnerability extends beyond simple script injection, as it can lead to complete administrative takeover of FortiADC devices. Attackers could leverage this weakness to steal session cookies, redirect users to malicious sites, modify configuration settings, or even inject backdoors into the appliance. The remote nature of the attack means that exploitation can occur without physical access to the device, making it particularly concerning for network administrators who rely on these appliances for critical traffic management and security functions. Organizations using affected FortiADC firmware versions face significant risk of unauthorized access to their network infrastructure, potentially allowing attackers to manipulate load balancing configurations, SSL termination settings, or other critical traffic handling capabilities. This vulnerability directly impacts the integrity and availability of network services managed by these appliances.
Mitigation strategies for CVE-2014-0331 primarily focus on firmware updates and input validation improvements. Organizations should immediately upgrade to FortiADC firmware version 3.2.1 or later, which contains the necessary patches to address this vulnerability. Additionally, implementing proper input sanitization and output encoding practices can provide defense-in-depth measures against similar vulnerabilities. Network administrators should also consider implementing web application firewalls to detect and block malicious requests targeting the locale parameter. The vulnerability highlights the importance of regular security updates and proper input validation in web application development, as outlined in OWASP Top 10 and NIST cybersecurity guidelines. Organizations should also conduct regular security assessments of their network infrastructure to identify and remediate similar vulnerabilities in other network devices and applications. The ATT&CK framework suggests that organizations should implement monitoring for suspicious parameter manipulation attempts and establish incident response procedures for potential exploitation of administrative interface vulnerabilities.