CVE-2025-66398
Signal K Server has Unauthenticated State Pollution leading to Remote Code Execution (RCE)
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.
INFO
Published Date :
Jan. 1, 2026, 6:15 p.m.
Last Modified :
Jan. 6, 2026, 6:34 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 3.1 | CRITICAL | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Signal K Server to version 2.19.0 or later.
- Apply vendor patches when available.
- Review and secure configuration files.
Public PoC/Exploit Available at Github
CVE-2025-66398 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-66398.
| URL | Resource |
|---|---|
| https://github.com/SignalK/signalk-server/releases/tag/v2.19.0 | Release Notes |
| https://github.com/SignalK/signalk-server/security/advisories/GHSA-w3x5-7c4c-66p9 | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-66398 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-66398
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-66398 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-66398 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jan. 06, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:signalk:signal_k_server:*:*:*:*:*:*:*:* versions up to (excluding) 2.19.0 Added Reference Type GitHub, Inc.: https://github.com/SignalK/signalk-server/releases/tag/v2.19.0 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/SignalK/signalk-server/security/advisories/GHSA-w3x5-7c4c-66p9 Types: Exploit, Vendor Advisory -
New CVE Received by [email protected]
Jan. 01, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H Added CWE CWE-78 Added CWE CWE-913 Added Reference https://github.com/SignalK/signalk-server/releases/tag/v2.19.0 Added Reference https://github.com/SignalK/signalk-server/security/advisories/GHSA-w3x5-7c4c-66p9