CVE-2026-9426
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 Edimax EW-7438RPn 1.31. This affects the function formHwSet of the file /goform/formHwSet. The manipulation of the argument Anntena/Mcs/regDomain/nic0Addr/nic1Addr/wlanAddr/wanAddr/wlanSSID/wlanChan/initgain/txcck/txofdm/submit-url results in stack-based buffer overflow. The attack can be executed remotely. The exploit is now public and may be used. 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 · moderate confidenceStack-based buffer overflow in Edimax EW-7438RPn v1.31 firmware's formHwSet function in /goform/formHwSet allows remote attackers to overflow multiple HTTP form arguments (including wlanSSID, wlanAddr, and submit-url) and potentially execute arbitrary code. The exploit is publicly available and the vendor did not respond to early disclosure.
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 modelAccess the device's web interface or check network device inventory to confirm the model is Edimax EW-7438RPnAffected if Device is not an Edimax EW-7438RPn, then not affected
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Check the firmware versionLog into the device's web management interface and look for a firmware version indicator in the status or settings page, or check via the device's administration panelAffected if Firmware version is not v1.31, then not affected (note: other versions may also be vulnerable but this CVE specifically targets v1.31)
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Determine if the web management interface is accessibleAttempt to access the device's HTTP/HTTPS interface on the LAN or WAN IP address (common ports 80 or 443) using a browserAffected if The web interface is not reachable at all, then the specific attack vector is not accessible
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Verify the formHwSet function is reachableThe vulnerability is triggered via the formHwSet function with manipulated parameters (Antenna, Mcs, regDomain, nic0Addr, nic1Addr, wlanAddr, wanAddr, wlanSSID, wlanChan, initgain, txcck, txofdm, submit-url). Check if the hardware settings page containing these parameters is accessible in the web interface.Affected if The hardware configuration interface with these parameters is accessible and exposed, the device is vulnerable to the overflow attack
If you have an Edimax EW-7438RPn device running firmware v1.31 with its web management interface accessible (especially if exposed to WAN), your environment is affected by this CVE.
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 dataReplace the unsupported Edimax EW-7438RPn device with a currently-supported model, or implement strict network segmentation and access controls to isolate the device from untrusted networks since no vendor patch is available.
- 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-2026-9426 — 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-2026-9426 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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