CVE-2026-6196
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 detected in Tenda F456 1.0.0.5. This affects the function fromexeCommand of the file /goform/exeCommand. Performing a manipulation of the argument cmdinput results in stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is now public and may 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 confidenceA stack-based buffer overflow vulnerability exists in the Tenda F456 router firmware version 1.0.0.5 in the /goform/exeCommand endpoint. The fromexeCommand function fails to properly validate the cmdinput parameter before using it in a stack-allocated buffer, allowing remote attackers to potentially overwrite return addresses and execute arbitrary code.
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 modelCheck the device label or web interface for the model number. Confirm it is a Tenda F456 router.Affected if The device is a Tenda F456 router.
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Check the firmware versionAccess the router's web interface, navigate to System Settings or Firmware Upgrade section, and note the firmware version displayed. Alternatively, use Nmap or curl to probe the device and compare against version 1.0.0.5.Affected if The firmware version is 1.0.0.5 or an earlier unpatched version.
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Verify remote web interface accessibilityAttempt to access the router's web interface from an external network using its public IP. Check if port 80 or 443 is open and reachable from the internet using a port scanner like Nmap.Affected if The router's web management interface is exposed to the internet.
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Confirm the vulnerable endpoint existsSend an HTTP GET or POST request to http://<device_ip>/goform/exeCommand using curl or a browser. Check if the endpoint responds or accepts the cmdinput parameter.Affected if The /goform/exeCommand endpoint is accessible and accepts the cmdinput parameter.
If the device is a Tenda F456 running firmware v1.0.0.5 (or earlier) with the web interface exposed remotely and the /goform/exeCommand endpoint accessible, the environment is affected by this buffer overflow 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 dataPrimary remediation is to apply vendor firmware updates if available; if no update exists, disable remote web management interfaces and place the device behind a firewall to reduce attack surface. Network segmentation can limit exposure to this remotely exploitable flaw.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-6196 — 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-2026-6196 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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