CVE•Published 2026-01-01•Modified 2026-10-07•1 article on news•5 live references•NVD data

CVE-2025-66398Signalk · Signal_k_server

Vulnerability data via NVD (ingested)

CVSS v3.1

9.6

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS percentile

Exploit Prediction Scoring System · top 3% of all CVEs

Weaknesses (CWE)

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')CWE-913Improper Control of Dynamically-Managed Code Resources

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.

Timeline

Published 2026-01-01

Modified 2026-10-07

External references

NVD MITRE Exploit-DB trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2025-66398

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Signalk Signal K Server"

All exposed Signalk Signal K Server instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Signal K Server"

HTTP body or banner mentions "Signal K Server" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2025-66398