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Stack-based Buffer OverflowWeakness · CWE-121

CVE-2026-36806

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 webAuthUserPwd parameter of the formModifyWebAuthUser 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 confidence

Buffer overflow vulnerability in Tenda W15E router firmware v15.11.0.10 allows attackers to cause Denial of Service via specially crafted HTTP requests containing oversized data in the webAuthUserPwd parameter of the formModifyWebAuthUser function.

MitigationApply vendor firmware patch if available; otherwise restrict network access to the router's web management interface and consider replacing the device if end-of-life.

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. Identify device model
    Access the device admin interface or check device labeling to confirm the model is Tenda W15E
    Affected if Device is not a Tenda W15E model
  2. Check firmware version
    Log into the Tenda router admin panel (typically at 192.168.0.1) and navigate to System Status or Firmware Version settings to determine the installed firmware version
    Affected if Firmware version is 15.11.0.10
  3. Verify web authentication is enabled
    Navigate to the web authentication settings page in the router admin interface under Wireless Settings or Access Control to see if web authentication (webAuthUserPwd) is configured and active
    Affected if Web authentication functionality is enabled and webAuthUserPwd parameter is in use
  4. Confirm formModifyWebAuthUser function exposure
    Inspect HTTP responses or attempt a GET request to the router's web interface to verify the formModifyWebAuthUser function handler exists and is accessible via the web interface
    Affected if The formModifyWebAuthUser function is present and exposed on the device

Device is affected if it is a Tenda W15E running firmware version 15.11.0.10 with web authentication functionality enabled and the formModifyWebAuthUser function accessible.

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 vendor firmware patch if available; otherwise restrict network access to the router's web management interface and consider replacing the device if end-of-life.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation2.0 h
  • Testing3.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,970
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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-2026-36806 in production — separate from our analysis above.

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What this is

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