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Stack-based Buffer OverflowWeakness · CWE-121

CVE-2026-36794

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 multiple stack overflows in the R7WebsSecurityHandler function via the username and password parameters. These vulnerabilities allow 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

Stack-based buffer overflow in the R7WebsSecurityHandler function of Tenda W3 Wireless Router firmware v1.0.0.3(2204). The username and password parameters in HTTP requests are not properly bounds-checked before being copied to stack buffers, allowing attackers to overflow the stack and crash the device.

MitigationRestrict access to the router's web management interface to trusted networks only; disable remote administration if not required; contact Tenda for firmware update or security patch.

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 router web admin interface or check the device label/box to confirm the model is Tenda W3 Wireless Router
    Affected if Device is not a Tenda W3 router
  2. Check firmware version
    Log into the router admin panel and navigate to System Settings or Firmware Upgrade page to view the current firmware version. It should display as v1.0.0.3(2204) or build 2204
    Affected if Firmware version is exactly v1.0.0.3(2204)
  3. Verify web management interface is accessible
    Attempt to access the router login page via HTTP (typically http://192.168.0.1 or http://tendawifi.com) from the network
    Affected if Web interface responds and accepts authentication requests
  4. Confirm R7WebsSecurityHandler is reachable
    Send a crafted HTTP POST request to the login endpoint with oversized username and password fields (greater than normal length limits). This function handles security validation and will trigger the overflow if vulnerable
    Affected if Request with oversized parameters causes unexpected behavior or service disruption

Affected if the device is a Tenda W3 router running firmware v1.0.0.3(2204) with the web management interface exposed to the network.

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

Restrict access to the router's web management interface to trusted networks only; disable remote administration if not required; contact Tenda for firmware update or security patch.

Have this fixed Scoped from the published advisory
  • Consultation6.0 h
  • Implementation12.0 h
  • Testing10.0 h
  • Review / QA4.0 h
32.0 hours of engineering $5,580
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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-2026-36794 in production — separate from our analysis above.

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What belongs here
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