The administrative web interface on Moxa EDS-405A and EDS-408A switches with firmware before 3.6 allows remote authenticated users to bypass a read-only protection mechanism by using Firefox with a web-developer plugin.
https://ics-cert.us-cert.gov/advisories/ICSA-15-246-03
http://www.moxa.com/support/download.aspx?type=support&id=328