RCE in Signalk Signalk-server
CVE-2025-66398
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…
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.001 (33.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.7 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.
Affected products
- Signalk Signalk-server — versions < 2.19.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- https://github.com/SignalK/signalk-server/security/advisories/GHSA-w3x5-7c4c-66p9 (x_refsource_CONFIRM)
- https://github.com/SignalK/signalk-server/releases/tag/v2.19.0 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-66398?
- CVE-2025-66398 is a critical-severity vulnerability in Signalk Signalk-server, classified under OS Command Injection. CVSS score: 9.7/10. Published 2026-01-01.
- How severe is CVE-2025-66398?
- Critical severity. CVSS v3 base score is 9.7 out of 10.
- Is CVE-2025-66398 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.