# CVE-2026-9294: Edimax BR-6428NS buffer overflow in formWanTcpipSetup

Source: https://junglewise.ai/threats/cve-2026-9294-edimax-br-6428ns-buffer-overflow-in-formwantcpipsetup  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-23. Updated: 2026-05-26  
License: CC BY 4.0 with a link back

CVE-2026-9294 · Severity: high · CVSS 8.8 · Published 2026-05-23

A security vulnerability exists in the Edimax BR-6428NS wireless router, a device used to provide internet connectivity for homes and small offices. 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 service or unauthorized access to the network traffic passing through the router.

Technologies: [Edimax BR-6428nS](https://junglewise.ai/threats/technologies/br-6428ns). Vendors: [Edimax](https://junglewise.ai/threats/vendors/edimax).

## Quick answers

**Is CVE-2026-9294 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9294 being exploited in the wild.

**How severe is CVE-2026-9294?** High severity, with a CVSS score of 8.8, published 23 May 2026.

**Which products and versions are affected?** Edimax BR-6428nS 1.10.

**Is there a fix for CVE-2026-9294?** 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-2026-9294 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-9294?** Check whether you run Edimax BR-6428nS 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 Edimax BR-6428NS router version 1.10. The flaw is located within the 'formWanTcpipSetup' function in the '/goform/formWanTcpipSetup' component, which handles POST requests for WAN configuration. By manipulating the 'pppUserName' argument with an overly long string, a remote attacker with low privileges can trigger a memory corruption. This can result in arbitrary code execution or a denial of service (system crash). While the vendor was notified, no patch has been released, and public exploit code is reportedly available.

## Affected products

- Edimax BR-6428NS 1.10

## Timeline

- 2026-05-23: advisory: Initial disclosure by VulDB and NVD
- 2026-05-23: disclosed: Public exploit code made available

## References

- [https://lavender-bicycle-a5a.notion.site/EDIMAX-BR-6428NS-formWanTcpipSetup-34b53a41781f80049b27db22e62fd8fd?source=copy_link](https://lavender-bicycle-a5a.notion.site/EDIMAX-BR-6428NS-formWanTcpipSetup-34b53a41781f80049b27db22e62fd8fd?source=copy_link)
- [https://vuldb.com/submit/811533](https://vuldb.com/submit/811533)
- [https://vuldb.com/vuln/365241](https://vuldb.com/vuln/365241)
- [https://vuldb.com/vuln/365241/cti](https://vuldb.com/vuln/365241/cti)

## Related threats

- [Edimax BR-6428NS command injection in formWlbasic](https://junglewise.ai/threats/cve-2026-9297-edimax-br-6428ns-command-injection-in-formwlbasic)
- [Edimax BR-6428NS command injection in formWlanM](https://junglewise.ai/threats/cve-2026-9296-edimax-br-6428ns-command-injection-in-formwlanm)
- [Edimax BR-6428NS buffer overflow in formWirelessTbl](https://junglewise.ai/threats/cve-2026-9295-edimax-br-6428ns-buffer-overflow-in-formwirelesstbl)
- [Edimax BR-6428NS command injection in formStaDrvSetup](https://junglewise.ai/threats/cve-2026-8777-edimax-br-6428ns-command-injection-in-formstadrvsetup)
- [Edimax BR-6428NS buffer overflow in formPPTPSetup](https://junglewise.ai/threats/cve-2026-8776-edimax-br-6428ns-buffer-overflow-in-formpptpsetup)