CVE-2025-71021 affects Tenda AX-1806 router firmware version 1.0.0.1. The vulnerability is a stack overflow in the serverName parameter of the sub_65A28 function. Attackers can exploit this flaw by sending a crafted request to the device. The successful exploitation results in a Denial of Service (DoS) condition. This is a buffer overflow vulnerability affecting network infrastructure equipment. The vulnerability allows remote attackers to disrupt router operations through malicious requests.