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According to The Heartbleed Bug website,
The Heartbleed Bug is a serious vulnerability in the popular OpenSSL cryptographic software library. This weakness allows stealing the information protected, under normal conditions, by the SSL/TLS encryption used to secure the Internet. SSL/TLS provides communication security and privacy over the Internet for applications such as web, email, instant messaging (IM) and some virtual private networks (VPNs).
The Heartbleed bug allows anyone on the Internet to read the memory of the systems protected by the vulnerable versions of the OpenSSL software. This compromises the secret keys used to identify the service providers and to encrypt the traffic, the names and passwords of the users and the actual content. This allows attackers to eavesdrop on communications, steal data directly from the services and users and to impersonate services and users.
You can check your website SSL port for Heartbleed vulnerability with the online Heartbleed check tool.
If you are a server admin with root access, you can check the OpenSSL version with this command:
openssl version
Also, you can check if OpenSSL is vulnerable by typing this command:
rpm -q --changelog openssl-1.0.1e | grep -B 1 CVE-2014-0160
If you see something like this, your SSL connections are secured and not affected by Heartbleed vulnerability.
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* Mon Apr 07 2014 Tomáš Mráz <tmraz@redhat.com> 1.0.1e-16.7
- fix CVE-2014-0160 - information disclosure in TLS heartbeat extension
By the way, cPanel automatically updates your server software so if you have a valid license, you should be OK by now.
