VMware has released vCenter 6.5b and ESXi 6.5 P01 are maintenance release the fixes some bugs, and a serious security bug in vCenter.
VMware vCenter 6.5b
this fixes this security bug: http://www.vmware.com/au/security/advisories/VMSA-2017-0004.html
Updates to time zones in the Linux Guest Operating System customization. vCenter Server Linux guest operating system customization supports latest time zones. For more information on time zone changes and daylight saving time (DST) changes in Linux guest operating systems, see the Time Zone Database by Internet Assigned Numbers Authority (IANA).
Updates to time zones in the Windows Guest Operating System customization. vCenter Server Windows guest operating systems customization supports the latest time zones. For more information on time zone changes and daylight saving time (DST) changes in Windows guest operating systems, see the Microsoft Knowledge Base article 3162835.
Additional functionality to the vSphere Client. This release delivers additional functionality to the HTML5-based vSphere Client. For more information, see Functionality Updates for the vSphere Client.
See the full release notes: http://pubs.vmware.com/Release_Notes/en/vsphere/65/vsphere-vcenter-server-650b-release-notes.html
ESXi 6.5 P01
This is a bug fixes, see the KB here: https://kb.vmware.com/kb/2148987