CVE-2026-36808
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 webAuthUserInfo 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 · high confidenceA buffer overflow vulnerability exists in the Tenda W15E router firmware v15.11.0.10 within the formAddWebAuthUser function's webAuthUserInfo parameter. Attackers can send crafted HTTP requests with excessively long strings to overflow the buffer, causing the device to crash and result in a Denial of Service condition.
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 the router modelAccess the router's web administration interface or check the device label/marketing to confirm it is a Tenda W15E model.Affected if The device is not a Tenda W15E router.
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Check the firmware versionLog into the router web interface and navigate to System Settings or Status page to view the firmware version. Alternatively, use the router's API or check via telnet/SSH if enabled.Affected if The installed firmware version is v15.11.0.10.
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Verify web management interface accessibilityAttempt to access the router's HTTP/HTTPS web interface from an external network IP address. Check router firewall rules or access control settings.Affected if The administrative web interface is reachable from untrusted networks.
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Inspect HTTP logs for the vulnerable parameterReview router logs, web server logs, or packet captures for requests to the formAddWebAuthUser endpoint containing the webAuthUserInfo parameter. Look for unusually long values.Affected if Requests with abnormally long webAuthUserInfo values are present in logs or traffic.
A user is affected if they are running Tenda W15E firmware v15.11.0.10 and the router's web administration interface is accessible from networks where untrusted parties can send crafted HTTP requests with oversized webAuthUserInfo parameters.
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-supplied firmware patches when available; alternatively, restrict access to the web management interface to trusted IPs or disable the webAuthUser feature if not required.
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-36808 — 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-2026-36808 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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