TOTOLINK T6 is a wireless dual-band router from China Gion Electronics (TOTOLINK).A stack overflow vulnerability exists in TOTOLINK T6 V4.1.9cu.5179_B20201015, which stems from the cloneMac parameter in the FUN_0041621c function that does not check its length for input data. A remote attacker can exploit this vulnerability to cause a denial of service.