CVE-2026-5991
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. Affected by this issue is the function formWrlExtraSet of the file /goform/WrlExtraSet. The manipulation of the argument GO results in stack-based buffer overflow. The attack may be launched 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 confidenceStack-based buffer overflow in Tenda F451 router firmware 1.0.0.7 within the formWrlExtraSet function. The GO argument is not properly bounds-checked before being copied to a stack buffer, allowing remote attackers to overwrite return addresses and potentially execute arbitrary code.
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= 1.0.0.7CVSS 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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Confirm device model is Tenda F451Identify the router by checking the physical device label, or access the web interface and look for the model name in the status or system information page.Affected if The device is a Tenda F451 router.
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Check installed firmware versionLog into the router web interface (commonly 192.168.0.1), navigate to System Settings, Administration, or a Version/Firmware information page. Locate the firmware version field.Affected if The firmware version is exactly 1.0.0.7.
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Determine if web management interface is WAN-accessibleFrom an external network, attempt to access the router's public IP address on port 80 or 443 (e.g., http://<WAN_IP>). Alternatively, check the router's Remote Management settings under Security or Administration to see if WAN access is enabled.Affected if The router's web interface (formWrlExtraSet function) is accessible from the WAN side or remote management is enabled.
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Verify the formWrlExtraSet endpoint existsAttempt to access the vulnerable endpoint via HTTP request to /goform/formWrlExtraSet or inspect the router's web binary (httpd) for the formWrlExtraSet function symbol if you have firmware extraction access.Affected if The formWrlExtraSet function handler is present and reachable on the device.
You are affected if you have a Tenda F451 router running firmware version 1.0.0.7 with the web management interface (specifically the formWrlExtraSet function) exposed to network attackers.
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 patch when available; until then, disable the affected function or restrict network access to the router's management interface.
- Consultation4.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-5991 — 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-2026-5991 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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