# CVE-2026-9424: Edimax EW-7438RPn OS command injection in formWlanMP

Source: https://junglewise.ai/threats/cve-2026-9424-edimax-ew-7438rpn-os-command-injection-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-2026-9424 · Severity: medium · CVSS 6.3 · Published 2026-05-25

A security vulnerability exists in the Edimax EW-7438RPn Wi-Fi extender, a device used to increase the range of wireless networks. An attacker can exploit this flaw to take control of the device by executing unauthorized system commands. This could lead to a complete compromise of the device, allowing an attacker to monitor network traffic or disrupt internet connectivity.

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

## Quick answers

**Is CVE-2026-9424 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9424 being exploited in the wild.

**How severe is CVE-2026-9424?** Medium severity, with a CVSS score of 6.3, published 25 May 2026.

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

**Is there a fix for CVE-2026-9424?** 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-2026-9424 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-9424?** 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

An OS command injection vulnerability exists in the Edimax EW-7438RPn firmware version 1.31 within the 'webs' binary. The root cause is the improper neutralization of special elements in the 'formWlanMP' function located at '/goform/formWlanMP'. Multiple parameters, including 'ateFunc', 'ateGain', and 'ateChan', are passed directly to the system shell without sufficient validation. A remote attacker with low privileges (authenticated) can exploit this by sending a crafted POST request containing shell metacharacters (e.g., backticks) to execute arbitrary OS commands. A public proof-of-concept demonstrates using this flaw to start a telnet daemon for remote shell access. No patch is currently available as the vendor did not respond to the disclosure.

## Affected products

- Edimax EW-7438RPn 1.31

## Timeline

- 2026-05-25: advisory: NVD publication date
- 2026-05-25: disclosed: Public disclosure of the vulnerability and PoC

## References

- [https://github.com/wudipjq/my_vuln/blob/main/Edimax/vuln_7/7.md](https://github.com/wudipjq/my_vuln/blob/main/Edimax/vuln_7/7.md)
- [https://vuldb.com/submit/813891](https://vuldb.com/submit/813891)
- [https://vuldb.com/vuln/365405](https://vuldb.com/vuln/365405)
- [https://vuldb.com/vuln/365405/cti](https://vuldb.com/vuln/365405/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)