VMware vCenter Server 4.0 before Update 4b, 5.0 before Update 2, and 5.1 before 5.1.0b; VMware ESXi 3.5 through 5.1; and VMware ESX 3.5 through 4.1 do not properly implement the Network File Copy (NFC) protocol, which allows man-in-the-middle attackers to execute arbitrary code or cause a denial of service (memory corruption) by modifying the client-server data stream.

The Virtual Machine Communication Interface (VMCI) implementation in vmci.sys in VMware Workstation 8.x before 8.0.5 and 9.x before 9.0.1 on Windows, VMware Fusion 4.1 before 4.1.4 and 5.0 before 5.0.2, VMware View 4.x before 4.6.2 and 5.x before 5.1.2 on Windows, VMware ESXi 4.0 through 5.1, and VMware ESX 4.0 and 4.1 does not properly restrict memory allocation by control code, which allows local users to gain privileges via unspecified vectors.