Executive brief
The Tenda W15E enterprise router is vulnerable to a flaw that can be triggered by sending a specially crafted web request. This vulnerability affects the device's web management interface, specifically the user authentication configuration. An attacker can exploit this to crash the router, leading to a denial of service that disrupts internet connectivity and network operations for all connected users.
Technical details
A stack-based buffer overflow exists in the 'formAddWebAuthUser' function of the Tenda W15E router (v15.11.0.10). The vulnerability is located in the handling of the 'webAuthUserInfo' HTTP parameter, which is retrieved via 'websGetVar'. The application uses 'strncpy' to copy data into a local buffer ('temp') based on the position of a newline character ('\n') found via 'strchr'. Because the length calculation '(int)pcVar1 - (int)p' does not account for the destination buffer's size, an attacker can provide a long string containing a newline character to overflow the buffer. This can be triggered via a network-reachable HTTP request to the 'addWebAuthUser' action, resulting in a process crash or device instability (Denial of Service).
Affected products
- Tenda W15E v15.11.0.10
Timeline
- 2026-03-18: other: CVE request submitted to MITRE
- 2026-06-06: disclosed: Public disclosure
- 2026-06-09: advisory: NVD published date