CVE-2026-6630
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 · uneditedA vulnerability was found in Tenda F451 1.0.0.7_cn_svn7958. This issue affects the function fromGstDhcpSetSer of the file /goform/GstDhcpSetSer of the component httpd. Performing a manipulation of the argument dips results in buffer overflow. The attack may be initiated remotely. The exploit has been made public and could be used.
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 confidenceBuffer overflow in Tenda F451 router httpd service. The fromGstDhcpSetSer function in /goform/GstDhcpSetSer fails to properly validate the 'dips' argument before copying it to a fixed-size buffer, allowing remote attackers to overflow the buffer and potentially execute arbitrary code via crafted HTTP requests.
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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/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 the device modelAccess the router's web interface or check the device label to confirm it is a Tenda F451 router.Affected if The device is a Tenda F451 router.
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Check the firmware versionLog into the router admin panel and navigate to System Settings > Firmware Upgrade, or check via CLI if available, then compare your version against any official Tenda F451 firmware releases.Affected if The installed firmware version has not been patched by the vendor.
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Verify the httpd service is accessibleConfirm the router's web interface (HTTP/HTTPS on ports 80/443) is reachable from your network.Affected if The httpd service is running and accessible.
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Confirm WAN exposure of the management interfaceCheck router firewall settings to determine if the web interface is accessible from the WAN (internet) side. This can be done via the admin panel under Security or Firewall settings, or by attempting to access the router's public IP from an external network.Affected if WAN-facing remote management is enabled, making the vulnerable endpoint directly reachable from the internet.
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Inspect the vulnerable endpoint availabilityVerify the /goform/GstDhcpSetSer endpoint exists and responds by sending a crafted HTTP POST request with the 'dips' parameter (use only in authorized, controlled testing environments).Affected if The GstDhcpSetSer endpoint is accessible and accepts the 'dips' parameter.
You are affected if you own a Tenda F451 router where the httpd service exposes the /goform/GstDhcpSetSer endpoint to an attacker and the firmware has not been patched.
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 update if available; otherwise restrict remote access to the router's web interface via firewall rules or disable WAN-facing management. Consider replacing end-of-life device.
- Consultation4.0 h
- Implementation16.0 h
- Testing8.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-6630 — 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-2026-6630 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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