VDSM allows remote attackers to cause a denial of service (connection blocking) by keeping an SSL connection open.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-7817
https://bugzilla.redhat.com/show_bug.cgi?id=1150812
http://www.openwall.com/lists/oss-security/2014/10/08/6