# CVE-2026-9461: Edimax EW-7438RPn stack overflow in formRadius

Source: https://junglewise.ai/threats/cve-2026-9461-edimax-ew-7438rpn-stack-overflow-in-formradius  
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-2026-9461 · Severity: high · CVSS 8.8 · 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 crash the device or potentially take full control of it by sending a specially crafted web request. This could lead to a complete loss of internet connectivity through the extender and unauthorized access to the device's settings.

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

## Quick answers

**Is CVE-2026-9461 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9461 being exploited in the wild.

**How severe is CVE-2026-9461?** 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-2026-9461?** 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-2026-9461 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-9461?** 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 vulnerability exists in the 'formRadius' function within the '/goform/formRadius' endpoint of the Edimax EW-7438RPn firmware version 1.31. The vulnerability is caused by the lack of bounds checking on the 'submit-url' POST parameter, which is copied directly into a fixed-size local stack buffer. An attacker with network access and low-level privileges (authenticated) can provide an overly long string to overwrite the function's return address. Successful exploitation can lead to a persistent denial of service (device crash) or remote code execution. As of the disclosure date, the vendor has not responded to reports or provided a patch.

## Affected products

- Edimax EW-7438RPn 1.31

## Timeline

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

## References

- [https://github.com/wudipjq/my_vuln/blob/main/Edimax/vuln_14/14.md](https://github.com/wudipjq/my_vuln/blob/main/Edimax/vuln_14/14.md)
- [https://vuldb.com/submit/813898](https://vuldb.com/submit/813898)
- [https://vuldb.com/vuln/365442](https://vuldb.com/vuln/365442)
- [https://vuldb.com/vuln/365442/cti](https://vuldb.com/vuln/365442/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)