CVE-2026-51844
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 · uneditedTenda AC7 v15.03.06.44 contains a stack buffer overflow vulnerability in the /goform/AdvSetMacMtuWan interface via the cloneType parameter.
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 confidenceA stack buffer overflow vulnerability exists in the Tenda AC7 router firmware v15.03.06.44 within the /goform/AdvSetMacMtuWan web interface. The cloneType parameter fails to properly validate input length before copying data to a stack-allocated buffer, potentially allowing an unauthenticated attacker to achieve remote code execution with elevated privileges.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 15.03.06.44CVSS 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
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 modelCheck if the target device is a Tenda AC7 router by accessing the router's web interface or checking the device label/documentationAffected if Device is a Tenda AC7 router
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Check firmware versionAccess the router's web interface (typically at 192.168.0.1) and navigate to System Settings or Firmware Upgrade to view the installed version, or use firmware extraction methods if you have a firmware imageAffected if Firmware version is exactly 15.03.06.44
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Verify vulnerable endpoint existsAttempt to access the URL /goform/AdvSetMacMtuWan on the router's web interface (port 80 or 443)Affected if The endpoint responds (returns any HTTP response, even an error page)
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Confirm cloneType parameter handlingSend a crafted HTTP POST request to /goform/AdvSetMacMtuWan with an unusually long string in the cloneType parameter (e.g., 500+ characters) and observe the responseAffected if The device accepts the request without rejecting it due to input length validation
If the device is a Tenda AC7 running firmware version 15.03.06.44 and the /goform/AdvSetMacMtuWan web interface is accessible, the environment is affected by this vulnerability.
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 vendor firmware updates when available; alternatively, disable or restrict access to the affected web interface and implement input length validation on the cloneType parameter.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-51844 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
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-2026-51844 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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