CVE-2026-9389
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 security vulnerability has been detected in Tenda F456 1.0.0.5. This affects the function frmL7ImForm of the file /goform/L7Im. The manipulation of the argument page leads to buffer overflow. The attack can be initiated remotely. The exploit has been disclosed publicly 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 · moderate confidenceBuffer overflow vulnerability in Tenda F456 router firmware 1.0.0.5 in the /goform/L7Im endpoint. The frmL7ImForm function does not properly validate the 'page' parameter before use, allowing remote attackers to overflow a buffer and potentially 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 router modelLog into the router web interface or check the device label to confirm it is a Tenda F456 modelAffected if The device is not a Tenda F456 router, then it is not affected by this specific CVE
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Check the firmware versionAccess the router admin panel, typically at 192.168.0.1, and navigate to System Status or Firmware Upgrade page to view the installed firmware versionAffected if The firmware version is 1.0.0.5, indicating it matches the affected version
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Verify the web management interface is accessibleAttempt to access the router login page at http://192.168.0.1 or the configured LAN IP address using a web browserAffected if The web interface is accessible from the network, meaning the attack surface exists for the vulnerable handler
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Confirm the L7Im handler existsSend an HTTP GET or POST request to the /goform/L7Im endpoint, such as: curl -s http://192.168.0.1/goform/L7Im or inspect the router's web binary for the frmL7ImForm functionAffected if The /goform/L7Im endpoint responds or the function is present in the firmware binary, confirming the vulnerable component is present
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Test the page parameter for length validationSend a crafted HTTP request to /goform/L7Im with an unusually long string in the 'page' parameter, for example: curl -X POST -d 'page=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...' http://192.168.0.1/goform/L7Im and observe if the router crashes, reboots, or accepts arbitrary-length input without rejecting itAffected if The router accepts an excessively long page parameter without proper bounds checking, indicating the buffer overflow vulnerability is present and exploitable
If the device is a Tenda F456 running firmware 1.0.0.5 and the /goform/L7Im web handler is accessible, then the environment is affected by CVE-2026-9389.
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 dataRestrict remote access to the router's web management interface, check Tenda for firmware updates, and if no patch is available, consider replacing the device with a currently supported model.
- 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-2026-9389 — 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-2026-9389 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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