UDP Port 2123 – gtp-control

About UDP Port 2123

Port 2123 carries the IANA assignment for gtp-control. The IANA description reads: ‘GTP-Control Plane (3GPP)’. This port is referenced in 2 IDS rules and exhibits low malware activity in monitored traffic.

IDS Rule References

2 IDS / security rules reference UDP port 2123. Treat that number as context, not a danger score. Many detection rules are written against groups of ports rather than one service, web ports especially, so common web alternate ports inherit large counts while genuinely sensitive services can show few rules or none. Presence in IDS rules does not mean traffic on this port is malicious.

Rule categories (top 1): trojan-activity (2).

Sample rule descriptions for UDP port 2123:

• ET EXPLOIT GTPDoor Trigger Packet Request
• ET EXPLOIT GTPDoor Trigger Packet Response

Malware Rule References

A small share of the IDS rules that reference this port are malware related.

2 of the 2 IDS rules that reference UDP port 2123 are malware related. That describes detection coverage across the whole internet, not anything about your machine or your network.

Families observed (top 1): GTPDoor (2).

Data Sources

This information is compiled from: IANA Service Name and Transport Protocol Port Number Registry and Emerging Threats Open Ruleset (BSD 2-Clause / GPLv2 per SID range).