I assume you all heard about the Heartbleed Bug in OpenSSL. ArangoDB uses the system OpenSSL under linux and Mac OS. If you update your version to 1.0.1g or better, everything is fine.
However, the Windows contains static version of OpenSSL. So in case you want to use ArangoDB with HTTPS, you should update your ArangoDB version. The current installer for 1.4.14 and 2.0.2 contains the OpenSSL 1.0.1g.