CVE-2025-27853
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedThe locally served web site on the Garmin WDU (v1 1.4.6 and v2 5.0) allows its authentication to be bypassed. The WDU web site only performs authentication with the client within the client's browser. The WebSockets used to communicate with the WDU server do not enforce any authentication. An attacker may bypass all authentication mechanisms by directly utilizing the remote APIs available on the websocket.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThe Garmin WDU device serves a web interface that performs authentication only in the client's browser using client-side checks. However, the WebSocket APIs used for backend communication do not enforce any authentication, allowing attackers to bypass all authentication by directly connecting to the WebSocket endpoint and invoking the remote APIs.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 1.4.6= 5.00CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the device modelAccess the device's web interface or check the physical device label to confirm it is a Garmin Empirbus Wireless Display Unit (WDU).Affected if The device is a Garmin Empirbus WDU.
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Check the firmware versionLog into the device's web interface and navigate to the system information or settings page to view the installed firmware version.Affected if The firmware version is 1.4.6 or 5.00.
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Verify WebSocket endpoint accessibilityUse a WebSocket client tool to connect to the device's WebSocket endpoint (typically ws://[device-ip]/ or wss://[device-ip]/) without providing any authentication credentials.Affected if The WebSocket connection is established successfully without any authentication token or credentials.
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Test API invocation without authAfter connecting to the WebSocket endpoint, send a simple API request (such as a status query command) to the device without including any session token or authentication header.Affected if The device responds to API commands over the WebSocket connection without rejecting the request due to missing authentication.
You are affected if you have a Garmin Empirbus WDU running firmware 1.4.6 or 5.00 where WebSocket connections can be established and API commands executed without any authentication.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataGarmin must release a firmware update that enforces authentication on WebSocket connections. Users should update to the patched firmware version once available and restrict network access to the device.
- Consultation4.0 h
- Testing2.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-27853 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-27853 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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