Multiple unspecified vulnerabilities in Google Chrome before 20.0.1132.22 on the Acer AC700; Samsung Series 5, 5 550, and Chromebox 3; and Cr-48 Chromebook platforms have unknown impact and attack vectors.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2012-3268
http://googlechromereleases.blogspot.com/2012/06/beta-channel-update-for-chromebooks.html