CVE-2026-36807
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 W15E v15.11.0.10 was discovered to contain a buffer overflow in the webAuthUserPwd parameter of the formAddWebAuthUser 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 W15E router firmware v15.11.0.10 within the formAddWebAuthUser function's webAuthUserPwd parameter. Attackers can send a specially crafted HTTP request with an oversized password value to trigger the overflow, causing the device to crash and result in a 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 device modelAccess router administration interface or check device label to confirm model is Tenda W15EAffected if Device is not a Tenda W15E router - different models are not affected by this specific vulnerability
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Check firmware versionIn router web UI, navigate to System Settings > Firmware Upgrade or check via telnet/SSH: cat /proc/version or nvram get firmware_versionAffected if Firmware version is 15.11.0.10 - this is the only version listed as affected
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Verify web authentication feature is accessibleCheck if router web interface is reachable on HTTP/HTTPS ports (typically 80/443). The formAddWebAuthUser function processes HTTP requests for adding web auth users.Affected if Router admin interface is exposed to untrusted networks - the vulnerability is triggered via specially crafted HTTP requests
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Confirm webAuthUserPwd parameter handling existsIf accessible, inspect the router's web authentication configuration page at System > User Management or similar path where web auth users can be addedAffected if The formAddWebAuthUser function and webAuthUserPwd parameter are present in the firmware - this confirms the vulnerable code path exists
Device is affected if it is a Tenda W15E router running firmware version 15.11.0.10 with its administrative web interface accessible to the attacker.
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 any available firmware update from Tenda that addresses this vulnerability. If no update exists, restrict access to the router's web management interface to trusted networks only.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-36807 — 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-2026-36807 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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