There are multiple out-of-bounds vulnerabilities in some processes of D-Link AC2600(DIR-2640) 1.01B04. Ordinary permissions can be elevated to administrator permissions, resulting in local arbitrary code execution. An attacker can combine other vulnerabilities to further achieve the purpose of remote code execution.
https://www.dlink.com/en/security-bulletin/
https://github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34202