I just want to elaborate slightly on my previous post for clarity.
The OpenSSL vulnerabilities that the 1.0.2e and 1.0.2f updates address do not affect OpenVPN clients. Version 1.0.2d should not be considered insecure for OpenVPN clients such as Viscosity.
Nevertheless, the latest beta versions of Viscosity always contain the latest version of OpenSSL. The current Beta of Viscosity for Windows contains version 1.0.2e of OpenSSL, and the next Beta release will contain version 1.0.2f.
Instructions for updating can be found at:
https://www.sparklabs.com/forum/t/beta-latest-build-of-viscosity-for-mac/46/1
Regards,
Eric