UDP Port 5061 – sips

About UDP Port 5061

Port 5061 is registered with the Internet Assigned Numbers Authority (IANA) for sips. The IANA description reads: ‘SIP-TLS’. This port appears in 4 IDS rules and does not have notable malware activity indicators in our data.

IDS Rule References

4 IDS / security rules reference UDP port 5061. 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 3): attempted-admin (2), protocol-command-decode (1), attempted-recon (1).

Sample rule descriptions for UDP port 5061:

• PROTOCOL-VOIP inbound INVITE message
• PROTOCOL-VOIP Possible SIP OPTIONS service information gathering attempt
• OS-OTHER Bash environment variable injection attempt
• ET EXPLOIT Possible CVE-2014-6271 Attempt Against SIP Proxy

Data Sources

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