VMware ESXi contains a double free flaw in OpenSLP’s SLPDProcessMessage() function. Exploitation of this issue may allow an unauthenticated attacker to remotely execute code on the ESXi host.
VMware vCenter Server contains a remotely accessible JMX RMI service that is not securely configured. An unauthenticated remote attacker that is able to connect to the service may be able use it to execute arbitrary code on the vCenter server.
VMware vCenter Server does not properly sanitize long heartbeat messages. Exploitation of this issue may allow an unauthenticated attacker to create a denial-of-service condition in the vpxd service.
Review patch and release notes here – http://www.vmware.com/security/advisories/VMSA-2015-0007.html