# CVE-2026-9401: Edimax BR-6675nD buffer overflow in formWanTcpipSetup

Source: https://junglewise.ai/threats/cve-2026-9401-edimax-br-6675nd-buffer-overflow-in-formwantcpipsetup  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-24. Updated: 2026-05-26  
License: CC BY 4.0 with a link back

CVE-2026-9401 · Severity: high · CVSS 8.8 · Published 2026-05-24

A security vulnerability exists in the Edimax BR-6675nD wireless router, a device used to provide internet connectivity and networking 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, unauthorized access to the local network, or the theft of sensitive data passing through the router.

Technologies: [Edimax BR-6675nD](https://junglewise.ai/threats/technologies/br-6675nd). Vendors: [Edimax](https://junglewise.ai/threats/vendors/edimax).

## Quick answers

**Is CVE-2026-9401 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-9401 being exploited in the wild.

**How severe is CVE-2026-9401?** High severity, with a CVSS score of 8.8, published 24 May 2026.

**Which products and versions are affected?** Edimax BR-6675nD 1.12.

**Is there a fix for CVE-2026-9401?** 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-2026-9401 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-9401?** Check whether you run Edimax BR-6675nD 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 classic buffer overflow (CWE-120) exists in the Edimax BR-6675nD firmware version 1.12. The vulnerability is located within the 'formWanTcpipSetup' function in the '/goform/formWanTcpipSetup' file, which handles POST requests for WAN configuration. By providing an overly long string to the 'pppUserName' argument, an attacker can overflow a memory buffer. This attack can be performed over the network, though it typically requires low-level authentication (PR:L). Successful exploitation could lead to remote code execution (RCE) or a denial of service (DoS) condition. As of the advisory date, the vendor has not responded to disclosure attempts, and no official patch is available.

## Affected products

- Edimax BR-6675nD 1.12

## Timeline

- 2026-05-24: disclosed: Exploit disclosed to the public
- 2026-05-24: advisory: NVD published the CVE record

## References

- [https://lavender-bicycle-a5a.notion.site/EDIMAX-BR-6675nD-formWanTcpipSetup-34b53a41781f8020ab30c8ca204ab15d?source=copy_link](https://lavender-bicycle-a5a.notion.site/EDIMAX-BR-6675nD-formWanTcpipSetup-34b53a41781f8020ab30c8ca204ab15d?source=copy_link)
- [https://vuldb.com/submit/811563](https://vuldb.com/submit/811563)
- [https://vuldb.com/vuln/365382](https://vuldb.com/vuln/365382)
- [https://vuldb.com/vuln/365382/cti](https://vuldb.com/vuln/365382/cti)

## Related threats

- [Edimax BR-6675nD command injection in /goform/stainfo](https://junglewise.ai/threats/cve-2026-9439-edimax-br-6675nd-command-injection-in-goform-stainfo)
- [Edimax BR-6675nD command injection in POST Request Handler](https://junglewise.ai/threats/cve-2026-9423-edimax-br-6675nd-command-injection-in-post-request-handler)
- [Edimax BR-6675nD buffer overflow in formWlSiteSurvey](https://junglewise.ai/threats/cve-2026-9403-edimax-br-6675nd-buffer-overflow-in-formwlsitesurvey)
- [Edimax BR-6675nD command injection in formWlanMP](https://junglewise.ai/threats/cve-2026-9402-edimax-br-6675nd-command-injection-in-formwlanmp)
- [Edimax BR-6675nD command injection in formUSBStorage](https://junglewise.ai/threats/cve-2026-9400-edimax-br-6675nd-command-injection-in-formusbstorage)