VMware ESXi 3.5, 4.0, and 4.1 and ESX 3.5, 4.0, and 4.1 do not properly implement port-based I/O operations, which allows guest OS users to gain guest OS privileges by overwriting memory locations in a read-only memory block associated with the Virtual DOS Machine.
                
                    Exploit prediction scoring system (EPSS) score
                    
                        
                            EPSS Score 0.003
                        
                    
                    
                        
                            EPSS Ranking 50.7%