CVE-2026-11557
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 weakness has been identified in Tenda F451 1.0.0.7/1.0.0.9. The affected element is the function fromNatlimit of the file /goform/Natlimit of the component Web Management Interface. Executing a manipulation of the argument page can lead to stack-based buffer overflow. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks.
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 confidenceStack-based buffer overflow in Tenda F451 router web management interface. The fromNatlimit function in /goform/Natlimit does not properly validate the 'page' parameter length before copying it to a fixed-size stack buffer, allowing remote attackers to overflow the stack and potentially achieve code execution.
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 modelAccess the router admin panel or check the device label to confirm it is a Tenda F451 router.Affected if The device is not a Tenda F451 router.
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Check the firmware versionLog into the Web Management Interface and navigate to the System or Firmware section to view the installed version, or use the router's admin page to retrieve firmware version information.Affected if The installed firmware version is 1.0.0.7 or 1.0.0.9.
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Verify Web Management Interface accessibilityDetermine if the router's Web Management Interface is reachable over the network. Check if the router is accessible on its LAN IP (default typically 192.168.0.1) or WAN IP if remote administration is enabled.Affected if The Web Management Interface is accessible from an untrusted network.
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Confirm the Natlimit feature existsAccess the router's Web Management Interface and look for a Natlimit or NAT limiting configuration page, or attempt to access the /goform/Natlimit endpoint via HTTP request.Affected if The Natlimit feature or endpoint exists and is accessible.
A user is affected if they have a Tenda F451 router running firmware version 1.0.0.7 or 1.0.0.9 with the Web Management Interface and Natlimit feature accessible, allowing the page argument in /goform/Natlimit to be exploited.
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 isolate the device on a restricted network segment and disable remote web management access.
- Consultation2.0 h
- Implementation4.0 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-2026-11557 — 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-2026-11557 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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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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