Unauthenticated Remote Command injection as root occurs in the Western Digital MyCloud NAS 2.11.142 /web/google_analytics.php URL via a modified arg parameter in the POST data.
https://www.stevencampbell.info/2016/12/command-injection-in-western-digital-mycloud-nas/
https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-1299