# CVE-2026-9425: Edimax EW-7438RPn stack overflow in formWlanMP

Source: https://junglewise.ai/threats/cve-2026-9425-edimax-ew-7438rpn-stack-overflow-in-formwlanmp  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-25. Updated: 2026-05-26  
License: CC BY 4.0 with a link back

CVE-2026-9425 · Severity: high · CVSS 8.8 · Published 2026-05-25

The Edimax EW-7438RPn, a Wi-Fi extender used to increase wireless coverage, contains a security flaw in its web management interface. An attacker can send specially crafted network requests to the device to cause it to crash or potentially take full control of the hardware. This could lead to a complete loss of internet connectivity for connected users or unauthorized access to the local network.

Technologies: [Edimax EW-7438RPn](https://junglewise.ai/threats/technologies/ew-7438rpn). Vendors: [Edimax](https://junglewise.ai/threats/vendors/edimax).

## Quick answers

**Is CVE-2026-9425 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9425 being exploited in the wild.

**How severe is CVE-2026-9425?** High severity, with a CVSS score of 8.8, published 25 May 2026.

**Which products and versions are affected?** Edimax EW-7438RPn 1.31.

**Is there a fix for CVE-2026-9425?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-9425 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-9425?** Check whether you run Edimax EW-7438RPn at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow exists in the 'webs' binary of Edimax EW-7438RPn firmware version 1.31. The vulnerability is located within the 'formWlanMP' function in the '/goform/formWlanMP' file. The root cause is a failure to validate the length of several POST parameters, including 'ateFunc', 'ateGain', and 'ateTxCount', before copying them into fixed-size stack buffers. An attacker with network access and basic authentication can exploit this by sending an overly long string in these parameters to overwrite the return address on the stack. This can lead to remote code execution (RCE) or a persistent denial of service (DoS) by crashing the device's web server. As of the advisory date, the vendor has not responded to the disclosure.

## Affected products

- Edimax EW-7438RPn 1.31

## Timeline

- 2026-05-25: disclosed: Public disclosure of the vulnerability and PoC
- 2026-05-25: advisory: CVE-2026-9425 published by NVD/VulDB

## References

- [https://github.com/wudipjq/my_vuln/blob/main/Edimax/vuln_8/8.md](https://github.com/wudipjq/my_vuln/blob/main/Edimax/vuln_8/8.md)
- [https://vuldb.com/submit/813892](https://vuldb.com/submit/813892)
- [https://vuldb.com/vuln/365406](https://vuldb.com/vuln/365406)
- [https://vuldb.com/vuln/365406/cti](https://vuldb.com/vuln/365406/cti)

## Related threats

- [Edimax EW-7438RPn stack overflow in formSDHCP](https://junglewise.ai/threats/cve-2026-9482-edimax-ew-7438rpn-stack-overflow-in-formsdhcp)
- [Edimax EW-7438RPn stack overflow in formStats](https://junglewise.ai/threats/cve-2026-9481-edimax-ew-7438rpn-stack-overflow-in-formstats)
- [Edimax EW-7438RPn stack overflow in formrefresh](https://junglewise.ai/threats/cve-2026-9480-edimax-ew-7438rpn-stack-overflow-in-formrefresh)
- [Edimax EW-7438RPn stack overflow in formLogout](https://junglewise.ai/threats/cve-2026-9479-edimax-ew-7438rpn-stack-overflow-in-formlogout)
- [Edimax EW-7438RPn stack overflow in formLicence](https://junglewise.ai/threats/cve-2026-9463-edimax-ew-7438rpn-stack-overflow-in-formlicence)