CVE-2026-36796
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 G0 v15.11.0.5 was discovered to contain a stack 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 stack overflow vulnerability exists in the formCropAndSetWewifiPic function of Tenda G0 router firmware v15.11.0.5, specifically in the picCropName parameter handling. Attackers can trigger the overflow by sending a crafted HTTP request with an oversized parameter value, 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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Confirm Tenda G0 router modelAccess the router's web interface or check the device label/metadata to verify the model is Tenda G0Affected if The device is not a Tenda G0 router
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Identify installed firmware versionLog into the router admin panel and navigate to System Settings > Firmware Version, or check via CLI if available, to determine the exact firmware versionAffected if Firmware version is v15.11.0.5 (exact match to affected version)
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Verify web management interface is enabledAttempt to access the router's HTTP/HTTPS web interface on the local network (typically ports 80 or 443) to confirm the management UI is activeAffected if The web management interface is accessible and active
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Check if vulnerable endpoint is reachableSend an HTTP POST request to the formCropAndSetWewifiPic endpoint (typically /cgi-bin/crop) with a crafted picCropName parameter to test for response (do not exploit, just verify the endpoint accepts the parameter)Affected if The endpoint responds to requests with the picCropName parameter, indicating the vulnerable function is present
You are affected if you have a Tenda G0 router running firmware v15.11.0.5 with the web management interface enabled and the crop functionality accessible.
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 dataApply available firmware updates from Tenda; if unavailable, restrict remote access to the router's web interface and implement network-level filtering to limit exposure to unauthenticated HTTP requests.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA3.0 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-2026-36796 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
- No weaponised exploit code, or anything meant to cause harm
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