THREATPORT/VULNERABILITY/CVE-2025-66398
CRITICAL SEVERITY

CVE-2025-66398

Signal K Server vulnerability

CVSS
9.6
EPSS
17.9%
EPSS pct
97th
Exploited
No known
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.
Affected vendor
Signalk
Affected product
Signal K Server
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Weakness type (CWE)
Published
2026-01-01

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 17.9% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2025-66398

  • Confirm whether Signalk Signal K Server is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2025-66398.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2025-66398

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2025-66398 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

Run a free external exposure scan

Are you exposed to CVE-2025-66398?

Run an instant, non-intrusive external scan to check your attack surface for CVE-2025-66398.

Start free scan

No credit card. Agentless.

Related vulnerabilities

CRITICAL
CVE-2022-30190
Microsoft Windows Support Diagnostic Tool (MSDT) Remote Code Execution Vulnerability
CRITICAL
CVE-2019-7195
QNAP Photo Station Path Traversal Vulnerability
CRITICAL
CVE-2019-7194
QNAP Photo Station Path Traversal Vulnerability