D-Link DIR-859 routers before v1.07b03_beta allow Unauthenticated Information Disclosure via the AUTHORIZED_GROUP=1%0a value, as demonstrated by vpnconfig.php.
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10147
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10146
https://medium.com/%40s1kr10s/d-link-dir-859-unauthenticated-information-disclosure-es-6540f7f55b03
https://medium.com/%40s1kr10s/d-link-dir-859-unauthenticated-information-disclosure-en-faf1a9a13f3f