Executive brief
A security vulnerability has been identified in the Tenda BE12 Pro router, a device used for home and business networking. An attacker can exploit this flaw to crash the router's management interface or potentially take full control of the device. This could lead to unauthorized monitoring of network traffic or the use of the router as a jumping-off point to attack other devices on the local network.
Technical details
A stack-based buffer overflow vulnerability exists in the Tenda BE12 Pro router firmware version 16.03.66.23. The flaw is located in the fromSetIpBind function within the /goform/SetIpBind endpoint, where the user-controlled 'page' parameter is processed using the unsafe sprintf function. Because the destination buffer 's' is fixed at 256 bytes and lacks length validation, an attacker can provide an oversized input to overwrite adjacent stack memory. This can be exploited remotely to achieve arbitrary code execution or a Denial of Service (DoS) by crashing the web server process. While some metrics suggest low privileges are required, a public PoC demonstrates the vulnerability being triggered via unauthenticated POST requests.
Affected products
- Tenda BE12 Pro 16.03.66.23
Timeline
- 2026-06-11: disclosed: Vulnerability details and PoC shared on GitHub.
- 2026-07-14: advisory: CVE published and added to NVD.