Certain models of D-Link wireless routers have a path traversal vulnerability. Unauthenticated attackers on the same local area network can read arbitrary system files by manipulating the URL.
https://www.twcert.org.tw/tw/cp-132-7877-b4674-1.html
https://www.twcert.org.tw/en/cp-139-7878-7c3d9-2.html
https://supportannouncement.us.dlink.com/security/publication.aspx?name=SAP10398