Security scan on Parallels H-Sphere control panel gives the following vulnerabilities:
OpenSSL Multiple Vulnerabilities < 0.9.8d
OpenSSL ASN.1 Error Denial of Service
OpenSSL PKCS Padding RSA Signature Forgery Vulnerability
That may course customers can not pass PCI (payment card industry) compliant.
Update OpenSSL to the latest available version. Because of Parallels H-Sphere do not include OpenSSL packages, customers should do the update manually, or ask operating system vendor for corresponded support.