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UDP
Vulnerable
161 SNMP
SNMP exposes monitoring and device-management data for switches, routers, printers, and appliances.
Security Context
Port 161 is high-risk when broadly exposed. Treat it as an attack-surface decision, not just a connectivity setting, and confirm whether the listener truly needs to be reachable.
- !Default community strings and broad SNMP exposure remain common risks.
Nmap Check
Use a version probe first so you confirm whether the expected service is really what is listening on this port.
nmap -sU -p 161 <host>Firewall Commands
UFW
sudo ufw allow 161/udpiptables
sudo iptables -A INPUT -p udp --dport 161 -j ACCEPT