Executive brief
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.
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