CVE-2021-31793
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 · uneditedAn issue exists on NightOwl WDB-20-V2 WDB-20-V2_20190314 devices that allows an unauthenticated user to gain access to snapshots and video streams from the doorbell. The binary app offers a web server on port 80 that allows an unauthenticated user to take a snapshot from the doorbell camera via the /snapshot URI.
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 NightOwl WDB-20-V2 doorbell camera exposes a web server on port 80 with an unauthenticated /snapshot endpoint that allows any remote user to retrieve camera snapshots without any authentication credentials. This represents a complete authentication bypass vulnerability enabling unauthorized access to video feeds.
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= 20190314CVSS 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
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 NightOwl WDB-20-V2 doorbell camera on your networkScan your network for devices with the vendor identification 'NightOwl' or model 'WDB-20-V2' visible in device enumeration, DHCP lease tables, or network scansAffected if A NightOwl WDB-20-V2 doorbell camera is present on the network
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Check the firmware version of the deviceAccess the device's web interface on port 80 and navigate to the system information or firmware version page, or use a network scanner that retrieves device firmware detailsAffected if The firmware version is exactly 20190314
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Verify port 80 is exposed and accessiblePerform a port scan targeting the IP address of the device to confirm port 80 is open and accepting connections from your testing locationAffected if Port 80 is open and reachable on the device
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Test the /snapshot endpoint for unauthenticated accessSend an HTTP GET request to http://<device_ip>/snapshot without providing any authentication headers or credentials, and observe if a snapshot image is returnedAffected if The /snapshot endpoint returns an image without requiring any authentication credentials
You are affected if you have a NightOwl WDB-20-V2 doorbell camera running firmware version 20190314 with port 80 exposed, and the /snapshot endpoint responds without 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 dataImplement network segmentation or firewall rules to restrict access to the device's web interface (port 80) from untrusted networks, or replace the device with a vendor-supported model that includes proper authentication.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,272.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-31793 — 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-2021-31793 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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