CVE-2025-34244 is an SQL injection vulnerability identified in Advantech WebAccess/VPN products prior to version 1.1.5. The flaw resides in the AjaxFwRulesController.ajaxDeviceFwRulesAction() method, which processes datatable search parameters without proper sanitization or neutralization of special SQL elements. This improper input validation allows an authenticated user with low-level observer privileges to craft malicious SQL queries that the backend database executes. The vulnerability enables attackers to extract sensitive information from the database, potentially including configuration details, user data, or other critical information stored within the WebAccess/VPN system. The CVSS 4.0 base score is 5.3 (medium), reflecting network attack vector, low attack complexity, no user interaction, and limited scope impact primarily on confidentiality and integrity. The vulnerability does not require elevated privileges beyond observer access, making it easier to exploit within environments where such accounts exist. No patches are currently linked, and no public exploits have been reported, but the risk remains significant due to the sensitive nature of industrial control and VPN management systems that Advantech WebAccess/VPN supports. The vulnerability is particularly concerning because it can be exploited remotely without user interaction, and the affected product is commonly used in industrial automation and critical infrastructure sectors.

For European organizations, this vulnerability could lead to unauthorized disclosure of sensitive operational and configuration data managed by Advantech WebAccess/VPN systems. Such data leakage can facilitate further attacks, including privilege escalation, lateral movement, or disruption of industrial control processes. Confidentiality breaches may expose intellectual property or critical infrastructure details, increasing the risk of sabotage or espionage. Integrity impacts, while limited, could arise if attackers modify database queries or data, potentially causing incorrect system behavior or denial of service. The vulnerability's exploitation by low-privileged users increases the threat surface, especially in large organizations with many observer-level accounts. Given the widespread use of Advantech products in European manufacturing, energy, and transportation sectors, the potential operational and reputational damage is significant. Additionally, regulatory compliance risks exist under GDPR if personal or sensitive data is exposed.

Organizations should immediately assess their use of Advantech WebAccess/VPN and identify affected versions prior to 1.1.5. Since no official patches are currently linked, temporary mitigations include restricting or auditing observer user accounts to minimize exposure. Implement strict access controls and ensure observer privileges are granted only when absolutely necessary. Deploy web application firewalls (WAFs) with SQL injection detection and prevention capabilities to monitor and block malicious input patterns targeting the vulnerable endpoint. Conduct thorough logging and monitoring of database queries and application logs to detect anomalous activities indicative of SQL injection attempts. Network segmentation should isolate WebAccess/VPN management interfaces from general user networks to reduce attack surface. Advantech customers should engage with the vendor for upcoming patches or advisories and plan prompt updates once available. Security teams should also conduct penetration testing focused on SQL injection vectors in the affected modules to validate defenses.