An issue was discovered on D-Link DSR-250 3.17 devices. Certain functionality in the Unified Services Router web interface could allow an authenticated attacker to execute arbitrary commands, due to a lack of validation of inputs provided in multipart HTTP POST requests.
https://www.dlink.com/en/security-bulletin
https://www.digitaldefense.com/news/zero-day-vuln-d-link-vpn-routers/
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10195