VMware Workstation before 5.5.4, when running a 64-bit Windows guest on a 64-bit host, allows local users to "corrupt the virtual machine's register context" by debugging a local program and stepping into a "syscall instruction."
VMware Workstation before 5.5.4 allows attackers to cause a denial of service against the guest OS by causing the virtual machine process (VMX) to store malformed configuration information.
Heap-based buffer overflow in the NAT networking components vmnat.exe and vmnet-natd in VMWare Workstation 5.5, GSX Server 3.2, ACE 1.0.1, and Player 1.0 allows remote authenticated attackers, including guests, to execute arbitrary code via crafted (1) EPRT and (2) PORT FTP commands.
Format string vulnerability in VMware Workstation 4.5.2 build-8848, if running with elevated privileges, might allow local users to execute arbitrary code via format string specifiers in command line arguments. NOTE: it is not clear if there are any default or typical circumstances under which VMware would be running with privileges beyond those already available to the attackers, so this might not be a vulnerability.