A vulnerability in VMware ESXi could allow an unauthenticated, remote malicious user to cause a denial of service (DoS) condition on a targeted system. The vulnerability exists because the affected software mishandles failed login attempts. An attacker could exploit this vulnerability by making multiple failed login attempts to an EXSi host. A successful exploit could allow the malicious user to cause a DoS condition on the system. VMware has confirmed the vulnerability and released software updates.