VMware has released vCenter 6.7 U3b and ESXi 6.7 U3b.
vCenter update includes a lot of security fixes, some of them critical, including upgrades of Linux tools to newer versions. The issue of upgrading vCenter when vCenter Server High Availability is enabled is also resolved.
You can check vCenter 6.7 U3b Release notes on the following link: vCenter Server 6.7 U3b Release Notes
ESXi update includes also a lot of resolved issues, including one where ESXi hosts might fail with a purple diagnostic screen during power off or deletion of multiple virtual machines on a vSphere Virtual Volumes datastore.
You can check ESXi 6.7 U3b Release notes on the following link: ESXi 6.7 U3b Release Notes