Executive brief
The Tenda W15E is a wireless router designed for small business and enterprise networking. A security flaw in the router's web management interface allows an attacker to crash the device by sending a specially crafted network request. This can lead to a total loss of internet connectivity and network services for all connected users, requiring a manual restart to recover.
Technical details
A stack-based buffer overflow exists in the Tenda W15E router within the 'formAddWebAuthWhiteUser' function. The vulnerability is triggered when the 'webAuthWhiteUserInfo' HTTP parameter is processed. The application uses 'websGetVar' to retrieve the user-supplied string and subsequently performs a 'strncpy' operation into a fixed-size buffer ('temp') without adequate bounds checking. Specifically, the length calculation using 'strchr' to find a newline character can result in a value exceeding the destination buffer's capacity. An unauthenticated remote attacker can exploit this by sending a crafted HTTP request containing a long string followed by a newline character, 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 of vulnerability details
- 2026-06-09: advisory: NVD published the CVE record