VMware ESXi contains an authentication bypass vulnerability. A malicious actor with sufficient Active Directory (AD) permissions can gain full access to an ESXi host that was previously configured to use AD for user management https://blogs.vmware.com/vsphere/2012/09/joining-vsphere-hosts-to-active-directory.html by re-creating the configured AD group ('ESXi Admins' by default) after it was deleted from AD.
Exploitability
AV:NAC:LPR:HUI:RScope
S:UImpact
C:HI:HA:H6.8/CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H