Information
Changing the default port used by MongoDB makes it harder for attackers to find the database and target it.
Rationale:
Standard ports are used in automated attacks and by attackers to verify which applications are running on a server.
Impact:
Hackers frequently scan IP addresses for commonly used ports, so it's not uncommon to use a different port to 'fly under the radar'. This is just to avoid detection, other than that there is no added safety by using a different port.
Solution
Change the port for MongoDB server to a number other than 27017.
In mongod.conf edit the below lines
# network interfaces
net:
port: $Orginasation Defined port
bindIp: $Orginasation Defined IP