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CVE-2025-66398

Signalk Signal K Server remote code execution

9.6 CRITICALPublic exploitEPSS 19.9%
  1. Published1 Jan 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected products

Signalk Signal K Server< 2.19.0

Remediation

Fixed in
Signalk Signal K Server≥ 2.19.0

References

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Frequently asked

Is CVE-2025-66398 being actively exploited?

CVE-2025-66398 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 19.9%.

How severe is CVE-2025-66398?

CVE-2025-66398 has a CVSS 3.1 base score of 9.6, rated critical. EPSS estimates a 19.9% probability of exploitation.

Which products are affected by CVE-2025-66398?

Affected products include Signalk Signal K Server.

How do I fix CVE-2025-66398?

Upgrade affected software to a fixed version, for example Signalk Signal K Server 2.19.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-66398 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.