CVE-2025-66398
9.6 · CRITICALOverview
CVE-2025-66398 is a critical-severity vulnerability affecting signalk signal_k_server. It was published on January 1, 2026 and has a CVSS 3.1 base score of 9.6 (CRITICAL).
This vulnerability has a CVSS 3.1 base score of 9.6, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
Signal K Server is a server application that runs on a central hub in a boat. Prior to version 2.19.0, an unauthenticated attacker can pollute the internal state (`restoreFilePath`) of the server via the `/skServer/validateBackup` endpoint. This allows the attacker to hijack the administrator's "Restore" functionality to overwrite critical server configuration files (e.g., `security.json`, `package.json`), leading to account takeover and Remote Code Execution (RCE). Version 2.19.0 patches this vulnerability.
Remediation
Check the references section for vendor advisories and patches from signalk. Update signal_k_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| signalk | signal_k_server | >= 0, < 2.19.0 | Affected |
Frequently Asked Questions
What is CVE-2025-66398?
CVE-2025-66398 is a critical-severity vulnerability affecting signalk signal_k_server. It was published on January 1, 2026 and has a CVSS 3.1 base score of 9.6 (CRITICAL).
How severe is CVE-2025-66398?
This vulnerability has a CVSS 3.1 base score of 9.6, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-66398?
Check the references section for vendor advisories and patches from signalk. Update signal_k_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-66398?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-66398 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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