Executive brief
The Tenda AC1206 router, a device used to provide wireless internet access, contains a security flaw in its web management interface. An attacker can send a specially crafted web request to the device to cause it to crash or reboot. This results in a denial of service, disrupting internet connectivity for all connected users.
Technical details
A stack-based buffer overflow exists in the 'fromGstDhcpSetSer' CGI handler of the Tenda AC1206 router (firmware v15.03.06.23). The vulnerability is triggered when the 'dips' parameter (and potentially 'username'/'password' parameters) is processed without adequate length validation. Specifically, the code uses 'strrchr' to find a period character and calculates a length for 'strncpy' based on the result; if the period is missing, the calculation can lead to a large copy operation that overflows the stack buffer. An unauthenticated attacker can exploit this by sending a crafted HTTP request to the affected endpoint, leading to a device crash (DoS) or potentially remote code execution.
Affected products
- Tenda (Shenzhen Tenda Technology Co., Ltd) AC1206 v15.03.06.23
Timeline
- 2026-03-10: other: CVE request submitted to MITRE
- 2026-06-06: disclosed: Public disclosure
- 2026-06-08: advisory: NVD published date