Port 27017 · MongoDB

Port 27017 is MongoDB, TCP.

MongoDB document database — default listener. Historically often left exposed with no auth enabled.

Palo Alto

Create the service object for this port, then allow the App-ID on it. Restricting the rule to the port's service object keeps the rule working on a non-default port and stops the App-ID matching on other ports. Replace the placeholders with your own rule name and zones.

set service tcp-27017 protocol tcp port 27017

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application mongodb service tcp-27017 action allow

Risk and exposure

Rated high risk. Services on this port are commonly targeted by attackers. Keep it off the internet, or put it behind a VPN or a strict source allow-list, and monitor access.

Check it

• Linux ss -tlnp | grep :27017
• PowerShell Test-NetConnection <host> -Port 27017
• nmap nmap -p 27017 <host>

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• 5984 CouchDB
• 6379 Redis
• 11211 Memcached

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