D-Link DIR-820L 1.05b03 was discovered to contain a remote code execution (RCE) vulnerability via the ping_addr parameter in the ping_v4 and ping_v6 functions.
https://www.dlink.com/en/security-bulletin/
https://legacy.us.dlink.com/pages/product.aspx?id=00c2150966b046b58ba95d8ae3a8f73d
https://github.com/4hsien/CVE-vulns/blob/main/D-Link/DIR-820L/CI_ping_addr/README.md