can someone teach me about whats going on n my firewall???

I have many meium threats in my firewall and I posted a question about a bunch of them earlier! But I want to learn more about this one! I want to know if its normal activity or some dangerouse thing!

 

Actor-windows/system32/svchost.exe

 

target- Norton internet security ccsvchst.exe

 

RISK- MEDIUM

 

Unauthorized access BLOCKED!

 

Someone please explain all this to me, is this normal?