CVE-2025-7214 is a vulnerability identified in the FNKvision FNK-GU2 product series up to version 40.1.7. The issue stems from the use of a risky cryptographic algorithm related to the MD5 hashing function within an unknown functionality involving the /etc/shadow file. The /etc/shadow file typically stores hashed user password information on Unix-like systems, and the use of MD5, a deprecated and cryptographically weak hashing algorithm, exposes the system to potential cryptographic weaknesses. Although the exact nature of the vulnerability's exploitation vector is not fully detailed, it is noted that an attacker requires physical access to the device to launch an attack. The attack complexity is high, indicating that exploitation is difficult and likely requires specialized knowledge or conditions. The vulnerability does not require user interaction, but it does require high privileges (authentication with elevated rights) to exploit. The CVSS 4.0 base score is 1.0, reflecting a low severity rating primarily due to the limited attack vector (physical access) and high attack complexity. The vulnerability has been publicly disclosed, but no known exploits are currently active in the wild. The risk arises from the continued use of MD5, which is vulnerable to collision and preimage attacks, potentially allowing attackers with physical access to compromise password hashes or related authentication mechanisms, undermining confidentiality and integrity of credentials stored on the device.

For European organizations using FNKvision FNK-GU2 devices, the impact of this vulnerability is limited but non-negligible. Since exploitation requires physical access and high privileges, remote attackers cannot easily leverage this flaw. However, in environments where devices are deployed in physically accessible locations (e.g., public-facing kiosks, unattended network equipment), malicious insiders or intruders could exploit the weak cryptographic algorithm to extract or manipulate password hashes. This could lead to credential compromise, unauthorized access, and potential lateral movement within the network. The use of MD5 weakens the overall security posture, especially in sectors with strict data protection regulations like GDPR, where credential theft could result in data breaches and regulatory penalties. The low CVSS score suggests limited immediate risk, but the presence of a deprecated cryptographic algorithm signals a need for proactive remediation to maintain compliance and security hygiene.

To mitigate this vulnerability, European organizations should: 1) Physically secure FNKvision FNK-GU2 devices to prevent unauthorized physical access, including locked enclosures and surveillance. 2) Upgrade the FNK-GU2 firmware to a version beyond 40.1.7 once a patch addressing the cryptographic weakness is released by FNKvision. In the absence of an official patch, consider disabling or restricting access to the vulnerable functionality if possible. 3) Implement strong access controls and monitoring on devices to detect any unauthorized attempts to access or manipulate the /etc/shadow file. 4) Conduct regular audits of device configurations and cryptographic settings to ensure deprecated algorithms like MD5 are phased out. 5) Educate staff on the risks of physical device tampering and enforce strict policies for device handling. 6) Where feasible, replace devices relying on weak cryptographic algorithms with more secure alternatives that use modern hashing functions such as SHA-256 or bcrypt for password storage.