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CVE-2025-69203— Signal K Server Vulnerable to Access Request Spoofing

Quick assessment

Affected
SignalK signalk-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Signal K Server是Signal K开源的一个船用中央服务器。 Signal K Server 2.19.0之前版本存在安全漏洞，该漏洞源于访问请求系统信任X-Forwarded-For标头且描述字段与权限字段显示不一致，可能导致社会工程学攻击。

CVSS 6.3 · Medium EPSS 0.30% · P21
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I. Basic Information for CVE-2025-69203

Vulnerability Information
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Vulnerability Title
Signal K Server Vulnerable to Access Request Spoofing
Source: CVE Program / CVE List V5
Vulnerability Description
Signal K Server is a server application that runs on a central hub in a boat. Versions prior to 2.19.0 of the access request system have two related features that when combined by themselves and with an information disclosure vulnerability enable convincing social engineering attacks against administrators. When a device creates an access request, it specifies three fields: `clientId`, `description`, and `permissions`. The SignalK admin UI displays the `description` field prominently to the administrator when showing pending requests, but the actual `permissions` field (which determines the access level granted) is less visible or displayed separately. This allows an attacker to request `admin` permissions while providing a description that suggests readonly access. The access request handler trusts the `X-Forwarded-For` HTTP header without validation to determine the client's IP address. This header is intended to preserve the original client IP when requests pass through reverse proxies, but when trusted unconditionally, it allows attackers to spoof their IP address. The spoofed IP is displayed to administrators in the access request approval interface, potentially making malicious requests appear to originate from trusted internal network addresses. Since device/source names can be enumerated via the information disclosure vulnerability, an attacker can impersonate a legitimate device or source, craft a convincing description, spoof a trusted internal IP address, and request elevated permissions, creating a highly convincing social engineering scenario that increases the likelihood of administrator approval. Users should upgrade to version 2.19.0 to fix this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Signal K Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Signal K Server是Signal K开源的一个船用中央服务器。 Signal K Server 2.19.0之前版本存在安全漏洞，该漏洞源于访问请求系统信任X-Forwarded-For标头且描述字段与权限字段显示不一致，可能导致社会工程学攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
SignalK signalk-server < 2.19.0 -

II. Public POCs for CVE-2025-69203

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III. Intelligence Information for CVE-2025-69203

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Vendor Advisories for CVE-2025-69203 (1)

Other References for CVE-2025-69203 (1)

Same Patch Batch · SignalK · 2026-01-01 · 6 CVEs total

CVE-2025-66398 9.7 CRITICAL Signal K Server has Unauthenticated State Pollution leading to Remote Code Execution (RCE)
CVE-2025-68620 9.1 CRITICAL Signal K Server vulnerable to JWT Token Theft via WebSocket Enumeration and Unauthenticate
CVE-2025-68272 7.5 HIGH Signal K Server Vulnerable to Denial of Service via Unrestricted Access Request Flooding
CVE-2025-68273 5.3 MEDIUM Signal K Server Vulnerable to Unauthenticated Information Disclosure via Exposed Endpoints
CVE-2025-68619 Signal K Server Vulnerable to Remote Code Execution via Malicious npm Package

IV. Related Vulnerabilities

Same product: signalk-server
Same vendor: SignalK
Same weakness: CWE-290

V. Comments for CVE-2025-69203

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