CVE-2020-16839
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 · uneditedOn Crestron DM-NVX-DIR, DM-NVX-DIR80, and DM-NVX-ENT devices before the DM-XIO/1-0-3-802 patch, the password can be changed by sending an unauthenticated WebSocket request.
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 confidenceA critical authentication bypass vulnerability in Crestron DM-NVX-DIR, DM-NVX-DIR80, and DM-NVX-ENT devices allows unauthenticated attackers to change administrative passwords via specially crafted WebSocket requests. This enables complete account takeover of the device without any valid credentials.
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= 1.0.1.788= 1.0.1.788= 1.0.1.788CVSS 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
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
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 Crestron device model on the networkScan the network for devices with Crestron DM-NVX-DIR, DM-NVX-DIR80, DM-NVX-DIR160, or DM-NVX-ENT in the device identification or hostname. Access the device web interface or use network discovery tools to confirm the exact model.Affected if The device model is DM-NVX-DIR, DM-NVX-DIR80, DM-NVX-DIR160, or DM-NVX-ENT.
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Check the installed firmware versionAccess the device web interface and navigate to the About or Status page to view the firmware version. Alternatively, use the device's API or console to retrieve the firmware version via 'show system info' or similar command.Affected if The firmware version is exactly 1.0.1.788.
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Verify WebSocket management interface accessibilityAttempt to access the WebSocket endpoint on the device (typically ws://<device-ip>/websocket or similar). Use a WebSocket client to send an unauthenticated request to the password change endpoint. If the device accepts the connection without authentication, the vulnerability is present.Affected if The WebSocket management interface accepts unauthenticated connections and allows password change requests without prior authentication.
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Review device admin account statusLog into the device administrative interface and verify that all admin accounts are present and have expected password settings. Check account creation/modification timestamps in the device logs or audit trail.Affected if Admin accounts have been modified or created without authorized action, or unexpected accounts appear in the user list.
A user is affected if they have a Crestron DM-NVX-DIR, DM-NVX-DIR80, DM-NVX-DIR160, or DM-NVX-ENT device running firmware version 1.0.1.788 with an accessible WebSocket management interface.
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 dataApply the DM-XIO/1-0-3-802 patch to all affected devices immediately. Restrict network access to device management interfaces and monitor for unauthorized password change attempts until patching is complete.
- Consultation3.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,168.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-16839 — 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-2020-16839 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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