VMware has released a security advisory to address multiple vulnerabilities in VMware Workstation, Player, ACE, Server, Fusion, ESX, and ESXi. The first of these vulnerabilities is due to a error in the VMware Descheduled Time Accounting driver. Exploitation of this vulnerability may result in denial of service in Windows-based virtual machines. The second vulnerability is due to a known error in the libpng package used by some VMware products. Exploitation of this vulnerability may allow an attacker to execute arbitrary code.