VI Client in VMware VirtualCenter before 2.5 Update 4, VMware ESXi 3.5 before Update 4, and VMware ESX 3.5 before Update 4 retains the VirtualCenter Server password in process memory, which might allow local users to obtain this password.

VMware VirtualCenter 2.5 before Update 3 build 119838 on Windows displays a user's password in cleartext when the password contains unspecified special characters, which allows physically proximate attackers to steal the password.

VMWare VirtualCenter client 2.x before 2.0.1 Patch 1 (Build 33643) and 1.4.x before 1.4.1 Patch 1 (Build 33425), when server certificate verification is enabled, does not verify the server's X.509 certificate when creating an SSL session, which allows remote malicious servers to spoof valid servers via a man-in-the-middle attack.