CVE-2025-68620 SignalK CVE debrief

Who should care

Administrators and users of Signal K Server, particularly those in marine or nautical contexts, should assess exposure and apply the patch. They should review and apply the vendor-provided patch to update Signal K Server to version 2.19.0 or later. They should also restrict access to the Signal K Server to trusted users and networks and monitor for suspicious activity on the Signal K Server.

Why it matters

CVE-2025-68620 is a critical vulnerability in Signal K Server versions prior to 2.19.0, allowing for authentication bypass through a combination of unauthenticated WebSocket request enumeration and token polling. Administrators and users of Signal K Server should assess exposure and apply the patch. The vulnerability enables attackers to steal JWT authentication tokens and hijack legitimate device credentials with zero authentication. Exploitation requires verification from official sources, but the patch in version 2.19.0 fixes the underlying issues.

• An attacker can steal JWT authentication tokens without prior authentication, leading to complete authentication bypass.
• The vulnerability allows for exploitation with zero authentication, enabling attackers to hijack legitimate device credentials.
• The attack can be performed by either creating a spoofed access request or passively monitoring the WebSocket stream to discover request IDs from legitimate devices.

Technical summary

Signal K Server versions prior to 2.19.0 have a critical vulnerability that allows for authentication bypass through a combination of unauthenticated WebSocket request enumeration and token polling. The vulnerability enables attackers to steal JWT authentication tokens and hijack legitimate device credentials with zero authentication. The attack can be performed by either creating a spoofed access request or passively monitoring the WebSocket stream to discover request IDs from legitimate devices. Administrators and users of Signal K Server should assess exposure and apply the patch.

Defensive priority

High

Recommended defensive actions

• Review and apply the vendor-provided patch to update Signal K Server to version 2.19.0 or later.
• Restrict access to the Signal K Server to trusted users and networks.
• Monitor for suspicious activity on the Signal K Server.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability in Signal K Server versions prior to 2.19.0, which allows for authentication bypass through unauthenticated WebSocket request enumeration and token polling. The vulnerability enables attackers to steal JWT authentication tokens and hijack legitimate device credentials with zero authentication. The attack can be performed by either creating a spoofed access request or passively monitoring the WebSocket stream to discover request IDs from legitimate devices. Exploitation

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.