The OpenSSL group has issued a vulnerability alert on April 7, 2014. You can find more information about CVE-2014-0160 at the Open SSL website and at http://heartbleed.com/.
H-Sphere and Confixx products are not affected, but if the servers have vulnerable SSL library they must be updated following the instructions for the OS, as it might be used by some 3rd party services running on the server.
To update RHEL 6 servers refer to instructions from the Red Hat advisory: https://rhn.redhat.com/errata/RHSA-2014-0376.html.
To update CentOS 6 servers use the instructions from the vendor blog: http://www.centosblog.com/critical-openssl-vulnerability-heartbleed-openssl-1-0-1-1-0-1f-patch-bug-centos-system.
- KB #121016 summary article for all Parallels products