Missing Authentication for Critical Function in WODESYS WD-R608U router

In WODESYS WD-R608U router (also known as WDR122B V2.0 and WDR28) due to lack of authentication in the configuration change module in the adm.cgi endpoint, the unauthenticated attacker can execute commands including backup creation, device restart and resetting the device to factory settings. The vendor was notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Only version WDR28081123OV1.01 was tested and confirmed as vulnerable, other versions were not tested and might also be vulnerable.