CVE-2026-36819
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 · uneditedShenzhen Tenda Technology Co., Ltd Tenda W20E v15.11.0.6 was discovered to contain a buffer overflow in the bindMACAddr parameter of the fromSetDhcpRules function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted HTTP 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 · moderate confidenceA buffer overflow vulnerability exists in the Tenda W20E router firmware v15.11.0.6 within the fromSetDhcpRules function's bindMACAddr parameter. Attackers can trigger this via crafted HTTP requests containing oversized MAC address input, causing the device to crash and result in denial of service.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 router modelAccess the router web interface or check the device label to confirm the model is Tenda W20EAffected if The device is not a Tenda W20E router - not affected
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Check firmware versionLog into the router admin panel and navigate to System Settings > Firmware Upgrade or System Status to view the installed firmware versionAffected if Firmware version is v15.11.0.6 - likely affected
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Verify HTTP management is enabledAttempt to access the router web interface via HTTP on port 80, or check the router security settings for remote HTTP management statusAffected if HTTP management interface is accessible from the network - attack surface present
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Confirm DHCP rules feature existsNavigate to the router web interface and locate the DHCP or DHCP Rules configuration section under network settingsAffected if The DHCP rules configuration interface is present and accessible - vulnerable function exists
You are affected if you have a Tenda W20E router running firmware v15.11.0.6 with the HTTP management interface accessible, as the buffer overflow resides in the fromSetDhcpRules function reachable via HTTP requests.
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 dataIf available, apply vendor firmware updates; otherwise restrict administrative interface access to trusted networks only and implement network-level filtering to prevent unauthenticated attackers from reaching the device's web management interface.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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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-2026-36819 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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