CVE-2026-9459
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 flaw has been discovered in Edimax EW-7438RPn 1.31. This affects the function formConnectionSetting of the file /goform/formConnectionSetting. Performing a manipulation of the argument max_Conn/timeOut results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
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 Edimax EW-7438RPn v1.31 wireless range extender. The formConnectionSetting function in /goform/formConnectionSetting does not properly validate the max_Conn and timeOut parameters before copying them into a fixed-size stack buffer, allowing remote attackers to overflow the stack 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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Confirm device model is Edimax EW-7438RPnAccess the device web interface or check the device label/marketing materials for the model number EW-7438RPnAffected if The device is not an Edimax EW-7438RPn model - other models are not affected by this specific CVE
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Identify firmware versionLog into the device web interface and navigate to the system status or firmware upgrade page to view the installed firmware version. Alternatively, check the admin interface or device documentation for version information.Affected if The firmware version is v1.31 - this is the specific version listed as affected in the CVE
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Verify web interface is network accessibleAttempt to access the device web interface over HTTP/HTTPS from a remote system, or check network firewall rules to determine if TCP ports 80 or 443 are open to untrusted networksAffected if The web interface is exposed to untrusted networks (not just trusted local segments) - the vulnerability is exploitable remotely via this access vector
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Confirm vulnerable CGI endpoint existsAttempt to access the URI /goform/formConnectionSetting on the device web server, or check if the formConnectionSetting function is present in the firmware via firmware analysisAffected if The /goform/formConnectionSetting endpoint responds to requests - this is the specific handler containing the vulnerable code
If the device is an Edimax EW-7438RPn running firmware v1.31 with the web interface network-accessible and the /goform/formConnectionSetting endpoint available, the environment is affected by CVE-2026-9459.
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 dataSince the vendor did not respond and no patch is available, restrict network exposure to the device (disable WAN management, place behind NAT/firewall), monitor for compromise, and consider replacing with a supported device.
- Consultation4.0 h
- Implementation24.0 h
- Testing12.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-9459 — 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-2026-9459 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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