Citrix XenServer 7.0 before Hotfix XS70E003, when a deployment has been upgraded from an earlier release, might allow remote attackers on the management network to "compromise" a host by leveraging credentials for an Active Directory account.
https://support.citrix.com/article/CTX213769
https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-6253