On Thursday 27th of January VMware finally released a new version of 7.0 Update 3 – Update 3c to combat the issues that subsequently saw the Update 3a and Update 3b be removed from circulation.
More info on the original issues can be found here:
Important Information on ESXi 7 Update 3 – VMware vSphere Blog

What’s new with VMware 7 Update 3c?

• vSphere ESXi 7 Update 3c
• vCenter 7 Update 3c
• Updates for the Apache Log4j Critical Security Vulnerabilities

For more information on Update 3c see the resources below:

• vSphere 7 Update 3 – What’s New | VMware
• Announcing Availability of vSphere 7 Update 3c – VMware vSphere Blog
• VMware ESXi 7.0 Update 3c Release Notes

As with most updates, Update 3c is not without its own issues, if you are thinking about upgrading straight away its worth a quick read of the known issues detailed in the table below: (source)