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Classic Buffer OverflowWeakness · CWE-120

CVE-2026-36817

HIGH · 7.5 CVSS v3.1 Published 2026-06-09
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

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 · unedited
Shenzhen Tenda Technology Co., Ltd Tenda W15E v15.11.0.10 was discovered to contain a buffer overflow in the webAuthWhiteUserInfo parameter of the formAddWebAuthWhiteUser 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 confidence

A buffer overflow vulnerability exists in the Tenda W15E v15.11.0.10 router firmware in the formAddWebAuthWhiteUser function's webAuthWhiteUserInfo parameter. Attackers can send a specially crafted HTTP request with oversized input to trigger the overflow, causing a Denial of Service condition.

MitigationApply the vendor-supplied firmware patch when available; until then, restrict administrative web interface access to trusted networks or disable the web authentication feature if possible.

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 checks

Work through these to decide whether this CVE applies to you.

  1. Confirm device model is Tenda W15E
    Access the router web interface or check the device label to verify the model is Tenda W15E
    Affected if Device is not a Tenda W15E router
  2. Check firmware version
    Log into the router admin panel and navigate to System Settings or Firmware Upgrade to view the installed firmware version. Compare against v15.11.0.10
    Affected if Firmware version is v15.11.0.10 (exact match)
  3. Locate web authentication whitelist settings
    In the router web interface, navigate to the Wireless Settings or Access Control section to find the web authentication white user configuration page where formAddWebAuthWhiteUser is used
    Affected if The webAuthWhiteUserInfo parameter and formAddWebAuthWhiteUser function are accessible in the interface
  4. Check for DoS indicators
    Review router system logs or uptime for unexpected reboots, crashes, or service disruptions that may indicate the buffer overflow was triggered
    Affected if Router has experienced unexplained crashes or DoS since exposure to untrusted networks

You are affected if you have a Tenda W15E router on firmware v15.11.0.10 with the web authentication white user feature accessible via the web interface.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply the vendor-supplied firmware patch when available; until then, restrict administrative web interface access to trusted networks or disable the web authentication feature if possible.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation2.0 h
  • Testing4.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,120
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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 sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-36817 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
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  • Version or environment caveats, and links to real fixes
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