Executive brief
The Tenda W15E is a wireless router used for business and home networking. A security flaw in how the device handles certain web requests allows an attacker to crash the router by sending a specially crafted message. This results in a denial of service, cutting off internet and network access for all connected users until the device is recovered.
Technical details
A stack-based buffer overflow exists in the Tenda W15E router firmware version v15.11.0.10. The vulnerability is located within the 'formDelwebAuthPic' function, which is mapped to the 'delWebAuthPic' action. The root cause is the unsafe use of 'sprintf' to copy the user-supplied 'picName' HTTP parameter into a fixed-size buffer ('picPath') without length validation. An unauthenticated remote attacker can exploit this by sending a crafted HTTP request with an excessively long 'picName' string, leading to a process crash and Denial of Service (DoS).
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