UDP Port 1900 – SSDP / UPnP (Network Service Discovery)
About UDP Port 1900
The Internet Assigned Numbers Authority (IANA) registers port 1900 for ssdp. The IANA description reads: ‘SSDP’. This port appears in 8 IDS rules and does not have notable malware activity indicators in our data.
IDS Rule References
8 IDS / security rules reference UDP port 1900. 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 5): attempted-admin (4), misc-attack (1), network-scan (1), attempted-dos (1), attempted-recon (1).
Sample rule descriptions for UDP port 1900:
- OS-WINDOWS Microsoft Windows UPnP malformed advertisement
- INDICATOR-SCAN UPnP service discover attempt
- SERVER-OTHER libupnp command buffer overflow attempt
- SERVER-OTHER libupnp command buffer overflow attempt
- SERVER-OTHER SSDP M-SEARCH ssdp-all potential amplified distributed denial-of-service attempt
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).