Executive brief
A security vulnerability has been identified in the Tenda JD12L Pro router, a device used to provide wireless internet connectivity. An attacker can exploit this flaw to crash the router's management interface or potentially take full control of the device. This could allow an unauthorized user to monitor network traffic or use the compromised router to launch further attacks on other devices within the home or office network.
Technical details
A stack-based buffer overflow vulnerability exists in the Tenda JD12L Pro router (firmware version 16.03.53.23) within the 'formWifiBasicSet' function of the '/goform/WifiBasicSet' file. The vulnerability is caused by the unsafe use of the 'strcpy' function when processing the 'security_5g' parameter from a POST request, which fails to validate the input length against the fixed 256-byte target buffer. A remote attacker can exploit this by sending a specially crafted, oversized POST request to overwrite adjacent memory on the stack. Successful exploitation can lead to a Denial of Service (DoS) by crashing the web server or arbitrary code execution by overwriting return addresses. While some reports suggest authentication may be required (PR:L), a public Proof of Concept (PoC) indicates the flaw might be triggered without authentication.
Affected products
- Tenda JD12L Pro 16.03.53.23
Timeline
- 2026-05-27: disclosed: Initial vulnerability report on GitHub
- 2026-06-29: advisory: CVE published to NVD dataset