CVE-2018-6692
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 · uneditedStack-based Buffer Overflow vulnerability in libUPnPHndlr.so in Belkin Wemo Insight Smart Plug allows remote attackers to bypass local security protection via a crafted HTTP post packet.
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 · moderate confidenceStack-based buffer overflow in libUPnPHndlr.so library of Belkin Wemo Insight Smart Plug. Remote attackers can bypass local security by sending crafted HTTP POST packets, potentially allowing arbitrary code execution or device compromise.
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 dataall versionsCVSS 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
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
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 Wemo Insight devices on your networkScan your network for UPnP devices using tools like nmap with UPnP detection (-sU -p 1900) or use a network scanner to find devices responding to SSDP/MUPnP probes. Look for devices advertising 'Wemo:Insight' in their service descriptions.Affected if A Belkin Wemo Insight Smart Plug is found responding on the network via UPnP or HTTP.
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Confirm the exact device modelSend an HTTP GET request to port 49152 or 49153 on the discovered device and examine the UPnP device description XML. Look for <modelName> or <friendlyName> fields containing 'Insight' or 'Wemo Insight'.Affected if The device model identifies as Wemo Insight Smart Plug.
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Check firmware versionAccess the device's web interface (typically on port 49153) or query the UPnP description for <serialNumber> or <modelNumber> that may encode firmware version, or use the Wemo mobile app to view device information.Affected if Any firmware version is found - all versions of Wemo Insight Smart Plug are affected by this CVE.
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Verify UPnP service is enabledConfirm the device is exposing UPnP services on port 1900/UDP and HTTP on port 49152-49154/TCP. Check that the libUPnPHndlr.so service is accessible by querying the UPnP control URL.Affected if UPnP and HTTP services are accessible on the device, which is required for the exploit to work.
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Assess network exposureReview firewall rules and network segmentation to determine if the device is accessible from untrusted networks. Check if port 49152-49154 or UPnP ports are exposed to the internet or guest networks.Affected if The device HTTP/UPnP services are reachable from networks outside your trusted internal segment.
If you have a Belkin Wemo Insight Smart Plug on your network with UPnP enabled and accessible, you are affected by CVE-2018-6692 since all firmware versions contain the vulnerable libUPnPHndlr.so library.
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 vendor firmware updates when available; meanwhile, isolate affected devices on restricted network segments and monitor for suspicious HTTP traffic to reduce attack surface.
- Consultation8.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2018-6692 — 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-2018-6692 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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