# CVE-2026-8775: Edimax BR-6428NS buffer overflow in formL2TPSetup

Source: https://junglewise.ai/threats/cve-2026-8775-edimax-br-6428ns-buffer-overflow-in-forml2tpsetup  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-18. Updated: 2026-05-18  
License: CC BY 4.0 with a link back

CVE-2026-8775 · Severity: high · CVSS 8.8 · Published 2026-05-18

A security vulnerability exists in the Edimax BR-6428NS wireless router, a device used to provide internet connectivity and networking for homes and small offices. An attacker can exploit a flaw in the router's configuration interface to potentially take control of the device or cause it to crash. This could lead to a complete loss of internet service, unauthorized access to network traffic, or a foothold for further attacks on the internal network.

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

## Quick answers

**Is CVE-2026-8775 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-8775 being exploited in the wild.

**How severe is CVE-2026-8775?** High severity, with a CVSS score of 8.8, published 18 May 2026.

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

**Is there a fix for CVE-2026-8775?** 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-2026-8775 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-8775?** 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 classic buffer overflow (CWE-120) exists in the Edimax BR-6428NS router version 1.10. The vulnerability is located within the formL2TPSetup function in the /goform/formL2TPSetup component, which handles POST requests for L2TP configuration. By sending a specially crafted POST request with an oversized L2TPUserName argument, a remote authenticated attacker can trigger a memory corruption. This can lead to arbitrary code execution or a system crash (DoS). While the attack requires low-level privileges (PR:L), an exploit has been publicly disclosed. The vendor has reportedly not responded to the disclosure, and no patch is currently confirmed.

## Affected products

- Edimax BR-6428NS 1.10

## Timeline

- 2026-05-18: advisory: Initial disclosure by VulDB and NVD
- 2026-05-18: disclosed: Exploit code has been published publicly

## References

- [https://lavender-bicycle-a5a.notion.site/EDIMAX-BR-6428NS-formL2TPSetup-34b53a41781f8046b38bffcc190c5277?source=copy_link](https://lavender-bicycle-a5a.notion.site/EDIMAX-BR-6428NS-formL2TPSetup-34b53a41781f8046b38bffcc190c5277?source=copy_link)
- [https://vuldb.com/submit/811530](https://vuldb.com/submit/811530)
- [https://vuldb.com/vuln/364400](https://vuldb.com/vuln/364400)
- [https://vuldb.com/vuln/364400/cti](https://vuldb.com/vuln/364400/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 buffer overflow in formWanTcpipSetup](https://junglewise.ai/threats/cve-2026-9294-edimax-br-6428ns-buffer-overflow-in-formwantcpipsetup)
- [Edimax BR-6428NS command injection in formStaDrvSetup](https://junglewise.ai/threats/cve-2026-8777-edimax-br-6428ns-command-injection-in-formstadrvsetup)