VMware has released vCenter 6.7 Update 3b and ESXi 6.7 Update 3b, this new update to help to fix the bugs and security concerns.

VMware vCenter 6.7 Update 3b

This is bug fixes and security fx version, for more check  the release notes: Release notes

VMware ESXi 6.7 Update 3b

With this new update, there are bug fixes and security fixes.

One of the important was the fix for the Revert snapshot CBT corruption problem. Note that you have check backup vendors KBs to check the support on this. More details check the release notes: Release notes