We haven't heard cng.sys has released any update file for 6.3.9600.19872 version, the latest version is 6.3.9600.19871.
Also I have checked KB4592495 which not contained the cng.sys files.
Do you mean the file was regarded as virus file with your antivirus software?
I noticed the issue was reported since 2018, did you update your antivirus software in those days?
What version you used before? Does previous version regarded as virus?
We could replace it with previous cng.sys version if the previous works well in your environment.
If other device in your environment have not update, try to check cng.sys located in C:\Windows\System32\drivers, copy it and replaced yours.
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Yes exactly, seems like an upcoming patch will address but no certainty yet...