CVE-2025-66398: critical vulnerability in signalk-server
Signal K Server has Unauthenticated State Pollution leading to Remote Code Execution (RCE)
Published · Updated
53Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 9.7epss 20%
from disclosure to weapon68 days
Published on NVDJan 1
1st PoC+68d
exploitation probability
20%top 3% of all CVEs
observed exploitation
nono source reports it
2 public exploit(s)
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Affected products
SignalK · signalk-serverpublic PoCs found — 2
githubgithub.com/joshuavanderpoll/cve-2025-66398★ 2githubgithub.com/showy-headteacher114/cve-2025-66398★ 1⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — signalk-server
In the same product, most dangerous first.
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