TOTOLINK AC1200 T8 shadow.sample hard-coded password

A vulnerability classified as critical was found in TOTOLINK AC1200 T8 4.1.5cu.861_B20230220. This vulnerability affects unknown code of the file /etc/shadow.sample. The manipulation leads to use of hard-coded password. The attack can be initiated remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.