On 24 March 2020, Apple released version 10.15.4 of Catalina to macOS users. This update contains a check of kernel extensions on your Mac. If an application with kernel extensions is detected, macOS displays a notification about legacy system extensions. Click OK to close the notification. Mar 10, 2017 I have the Mac Catalina and Norton 8.5 problem with high CPU utilization with file com.symantec.mes.systemextension, and fan running full on, and low battery life due to this on a two day old Macbook Air8,2. That file named navlibx is a library of Symantec the virus scanner of Mac it's not a virus but if u have the old version is not compatible with macOS Catalina. Just update Symantec and don't install a cleaner for it because that can give u adware spyware or virus. It's only at Mac Catalina at the newest version available.
Any AV software is totally useless on the Mac. All they do is slow your computer down and do nothing useful in return. Anything by Symantec is falls into the 'worst of' category.
I realize this doesn't help since your corporation seems to be controlled by IT drones who understand nothing about Macs. This is not unusual. They try to apply all the problems of malware in Windows to the Mac as if it's all the same. Qc view for mac catalina.