VMware vSphere Client 4.0, 4.1, 5.0 before Update 3, and 5.1 before Update 2 does not properly validate updates to Client files, which allows remote attackers to trigger the downloading and execution of an arbitrary program via unspecified vectors.
VMware vSphere Client 5.0 before Update 3 and 5.1 before Update 2 does not properly validate X.509 certificates, which allows man-in-the-middle attackers to spoof SSL servers via a crafted certificate.