VMware has released a new patch for ESXi 6.0, 6.5 og 6.7.
This fixes a security issue with the VMXNET3 driver, and the 6.7 patch also contains some vSAN and replications fixes.
See the ESXi 6.0 patch release notes here: https://docs.vmware.com/en/VMware-vSphere/6.0/rn/esxi600-201811001.html
See the ESXi 6.5 patch release notes here: https://docs.vmware.com/en/VMware-vSphere/6.5/rn/esxi650-201811001.html
See the ESXi 6.7 patch release notes here: https://docs.vmware.com/en/VMware-vSphere/6.7/rn/esxi670-201811001.html