CVE-2026-14167: ads-tec Industrial IT DVG-IRF Series Privilege Escalation Vulnerability

CVE-2026-14167 describes a critical authorization bypass vulnerability affecting several ads-tec Industrial IT DVG-IRF series products, including DVG-IRF1401, DVG-IRF1421, DVG-IRF3401, DVG-IRF3421, DVG-IRF3801, and DVG-IRF3821 with versions prior to 2.3.0. This flaw allows a low-privileged remote attacker to circumvent authorization checks and execute configuration changes that are typically restricted to administrator-level users. This includes sensitive actions such as managing system permissions, potentially leading to complete compromise of the affected devices. The vulnerability carries a CVSS v3.1 base score of 8.8 (High), highlighting its severe impact on confidentiality, integrity, and availability. Organizations using these industrial IT devices are strongly advised to review their deployed versions and apply updates to prevent unauthorized access and control.

Attack Chain

1. Initial Access: A remote attacker gains low-privileged access to an affected ads-tec Industrial IT DVG-IRF series device. The method for initial low-privileged access is not detailed but typically involves legitimate credentials or another, less severe vulnerability.
2. Authorization Bypass: The attacker identifies and exploits the incorrect authorization vulnerability (CWE-863) within the device's management interface or API.
3. Privileged Configuration Change Request: The attacker crafts and sends requests to the device's management interface or API, attempting to modify configuration settings that usually require administrator privileges.
4. System Accepts Unauthorized Change: Due to the authorization bypass, the device incorrectly validates the attacker's low-privileged session as having sufficient permissions.
5. Permission Management: The attacker successfully executes privileged actions, such as modifying user permissions, creating new administrative accounts, or altering critical system settings.
6. Privilege Escalation: The attacker elevates their privileges on the device, gaining full administrative control over the affected industrial IT product.
7. System Compromise: With administrative control, the attacker can manipulate device functions, inject malicious configurations, access sensitive data, or disrupt operations.

Impact

Successful exploitation of CVE-2026-14167 grants a low-privileged remote attacker the ability to perform administrative actions, leading to a complete compromise of the affected ads-tec Industrial IT DVG-IRF series devices. This can result in unauthorized access to sensitive operational technology (OT) or industrial control system (ICS) configurations, disruption of critical infrastructure processes, or data manipulation. Given these are industrial IT products, the impact could extend to significant operational downtime, safety hazards, environmental damage, or severe financial losses. The specific number of affected organizations or observed exploitation is not detailed, but the high CVSS score indicates a substantial risk.

Recommendation

• Immediately patch all affected ads-tec Industrial IT DVG-IRF series products (DVG-IRF1401, DVG-IRF1421, DVG-IRF3401, DVG-IRF3421, DVG-IRF3801, DVG-IRF3821) to version 2.3.0 or later as advised in the CERT VDE advisory for CVE-2026-14167.
• Review network segmentation and access control policies for devices listed in the affected_products section to minimize exposure to unauthorized remote access.
• Monitor authentication and authorization logs for unusual configuration changes or login attempts on ads-tec Industrial IT devices.