On D-Link DIR-615 devices, a normal user is able to create a root(admin) user from the D-Link portal.
dir-615_t1_firmware
CVE-2021-42627
The WAN configuration page “wan.htm” on D-Link DIR-615 devices with firmware 20.06 can be accessed directly without authentication which can lead to disclose the information about WAN settings and also leverage attacker to modify the data fields of page.