CVE-2026-36813
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 picCropName parameter of the formCropAndSetWewifiPic 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 confidenceA buffer overflow vulnerability exists in the Tenda W15E v15.11.0.10 router firmware in the picCropName parameter of the formCropAndSetWewifiPic function. An attacker can send a crafted HTTP request with an overly long string to overflow the buffer, causing the device to crash and resulting in a Denial of Service.
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 device model and firmware versionAccess the router admin panel or check via telnet/SSH. Look for system status or firmware version information typically found under 'System Status', 'Device Info', or 'Firmware Version' in the web UI. Alternatively, check the HTTP response headers or use Nmap with service detection to probe the web interface.Affected if The device is a Tenda W15E running firmware version v15.11.0.10 specifically.
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Confirm web management interface is accessibleAttempt to reach the router's web interface via HTTP (typically on ports 80 or 8080). Use a browser or curl to access the login page. The vulnerability exists in the formCropAndSetWewifiPic function which is part of the web interface.Affected if The web management interface is exposed and reachable on the network.
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Verify wewifi feature is enabledLog into the router admin panel and look for 'Wewifi' or 'WiFi extension' features under Wireless or Advanced settings. The vulnerable function name 'formCropAndSetWewifiPic' suggests this feature must be active for the attack surface to exist.Affected if The Wewifi or similar picture cropping feature is enabled on the device.
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Check for abnormal device behaviorMonitor the router for unexpected crashes, restarts, or unresponsive states. Review system logs if accessible via the admin panel under 'System Log' or 'Logs'. Look for signs of denial of service or unusual HTTP requests.Affected if The device has experienced unexplained crashes, restarts, or shows high CPU/memory usage after potential exploitation attempts.
You are affected if you are running a Tenda W15E router on firmware v15.11.0.10 with the web interface and wewifi feature accessible, and you observe device crashes or denial of service conditions.
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 dataImplement strict input length validation on the picCropName parameter to enforce reasonable character limits before processing. As this is a firmware-level vulnerability, contact Tenda for an official firmware patch that properly bounds-checks the input.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
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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 sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-36813 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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- Version or environment caveats, and links to real fixes
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