A stack-based buffer overflow vulnerability (CVE-2026-3769) was discovered in Tenda F453 router firmware version 1.0.0.3. The vulnerability affects the WrlclientSet function in the /goform/WrlclientSet file, where manipulation of the GO argument leads to buffer overflow. The vulnerability can be exploited remotely and a public exploit is available. This represents a high-severity security issue for affected Tenda router users as attackers can potentially execute arbitrary code remotely.