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Stack-based Buffer OverflowWeakness · CWE-121

CVE-2026-36771

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 W3 Wireless Router v1.0.0.3(2204) was discovered to contain a stack overflow in the wl_radio parameter of the formwrlSSIDset function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted input.

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

Stack buffer overflow in the wl_radio parameter of the formwrlSSIDset function in Tenda W3 Wireless Router v1.0.0.3(2204) allows remote attackers to cause Denial of Service via crafted input exceeding expected parameter bounds.

MitigationApply vendor patch when available; until then, restrict network access to router management interface via firewall and disable WAN management access.

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 the device model
    Access the router's web interface (typically http://192.168.0.1 or http://192.168.1.1) and navigate to the System Status or Device Information page to confirm the device is a Tenda W3 Wireless Router.
    Affected if The device is not a Tenda W3 router.
  2. Check the firmware version
    In the router's web interface, go to System Status or Administration > Firmware Upgrade to view the installed firmware version. Compare it against v1.0.0.3(2204).
    Affected if The installed firmware version is v1.0.0.3(2204).
  3. Verify the web management interface is accessible
    Attempt to access the router's web interface from a remote network location (outside the local LAN). Confirm the HTTP/HTTPS management port is open on the WAN interface.
    Affected if The router's web interface is reachable from a remote network.
  4. Check if remote administration is enabled
    In the router's web interface, navigate to Advanced Settings > Remote Management (or similar). Determine if remote access via WAN is enabled.
    Affected if Remote administration is enabled and the web interface is accessible from WAN.

A user is affected if they are running Tenda W3 firmware v1.0.0.3(2204) and the router's web interface is accessible remotely (particularly with remote administration enabled).

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 patch when available; until then, restrict network access to router management interface via firewall and disable WAN management access.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Testing6.0 h
  • Review / QA3.0 h
13.0 hours of engineering $2,240
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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-2026-36771 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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