SignalK signalk-server is a server application deployed on central hubs in boats to manage and distribute marine data. Versions prior to 2.19.0 contain an unauthenticated information disclosure vulnerability (CVE-2025-68273) classified under CWE-200, which allows any unauthenticated user to retrieve sensitive system information. Specifically, attackers can access the full SignalK data schema, details of connected serial devices, and installed analyzer tools. This information leakage does not directly compromise data integrity or availability but provides attackers with valuable reconnaissance data that can be leveraged for subsequent targeted attacks against the vessel's systems or network. The vulnerability is remotely exploitable over the network without requiring any user interaction or privileges, increasing its risk profile. The CVSS 3.1 base score is 5.3 (medium), reflecting the ease of exploitation and limited confidentiality impact. The vulnerability was publicly disclosed on January 1, 2026, and patched in version 2.19.0 of signalk-server. No known exploits have been reported in the wild, but the exposure of system internals could facilitate more sophisticated attacks if combined with other vulnerabilities or misconfigurations.

For European organizations involved in maritime operations, especially those using SignalK signalk-server on vessels or maritime hubs, this vulnerability poses a moderate risk. The unauthorized disclosure of system information can aid attackers in mapping the network and identifying connected devices, which may be critical for navigation, communication, or control systems. This reconnaissance can be a precursor to more damaging attacks such as device manipulation, data tampering, or denial of service. Although the vulnerability itself does not allow direct control or data modification, the information exposed could be leveraged by threat actors targeting maritime infrastructure, which is strategically important in Europe for trade, defense, and transportation. The impact is heightened for organizations operating in sensitive or high-traffic maritime regions where attackers may seek to disrupt operations or gather intelligence.

European maritime organizations should immediately upgrade all instances of signalk-server to version 2.19.0 or later to remediate this vulnerability. In addition, network segmentation should be enforced to isolate signalk-server hubs from public or less trusted networks, reducing exposure to unauthenticated access. Implement strict access controls and monitoring on maritime network devices to detect unusual reconnaissance activity. Employ network-level protections such as firewalls and intrusion detection systems configured to alert on anomalous requests targeting signalk-server endpoints. Regularly audit and inventory connected serial devices and analyzer tools to identify unauthorized changes or additions. Finally, integrate vulnerability management processes to ensure timely patching of maritime software components and maintain situational awareness of emerging threats targeting marine infrastructure.