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Vulnerabilities

Vulnerability · CVE-2025-66398

Signal K Server is a server application that runs on a central hub in a boat.

Published Jan 1, 2026 · catalog updated Jan 5, 2026 · SignalK

Last checked Nov 3, 2026. A connected source was read within the last 7 days.

Check this week

CVE-2025-66398 is not in CISA KEV. FIRST estimates a 19.85% chance of exploitation in the next 30 days. Check whether you run SignalK.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Critical9.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
19.85%
Remediation
Version ranges on file
Affected products
vendor SignalK signalk-server < 2.19.0

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 ( ) of the server via the endpoint. This allows the attacker to hijack the administrator's "Restore" functionality to overwrite critical server configuration files (e.g., , ), leading to account takeover and Remote Code Execution (RCE). Version 2.19.0 patches this vulnerability.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor SignalK signalk-server < 2.19.0< 2.19.0

How to fix CVE-2025-66398

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-66398 is not in CISA KEV. FIRST estimates a 19.85% chance of exploitation in the next 30 days. Check whether you run SignalK.

Which versions are affected?

Compare what you have installed with SignalK signalk-server < 2.19.0 < 2.19.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 19.85%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 1, 2026 · EUVD

    Detected

    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 ( ) of the server via the endpoint. This allows the attacker to hijack the administrator's "Restore" functionality to overwrite critical server configuration files (e.g., , ), leading to account takeover and Remote Code Execution (RCE). V

  2. Jan 5, 2026 · EUVD

    Updated

    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 ( ) of the server via the endpoint. This allows the attacker to hijack the administrator's "Restore" functionality to overwrite critical server configuration files (e.g., , ), leading to account takeover and Remote Code Execution (RCE). V

Sources

  • CVE.orgVulnerability recordCVE-2025-66398

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-66398

    30-day exploitation probability 19.85%

    first.org
  • EUVDVulnerability recordEUVD-2025-206140

    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 ( ) of the server via the endpoint. This allows the attacker to hijack the administrator's "Restore" functionality to

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 3, 2026
  • CVE.orgOct 31, 2026
  • EUVDOct 31, 2026