eWON devices with firmware before 10.1s0 do not trigger the discarding of browser session data in response to a log-off action, which makes it easier for remote attackers to obtain access by leveraging an unattended workstation.
https://ics-cert.us-cert.gov/advisories/ICSA-15-351-03
http://www.securityfocus.com/bid/79625
http://seclists.org/fulldisclosure/2015/Dec/118
http://ewon.biz/support/news/support/ewon-security-enhancement-7529-01