TCP Port 4786 – smart-install
About TCP Port 4786
The Internet Assigned Numbers Authority (IANA) registers port 4786 for smart-install. The IANA description reads: ‘Smart Install Service’. 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 TCP port 4786. 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 2): attempted-admin (5), bad-unknown (3).
Sample rule descriptions for TCP port 4786:
- SERVER-OTHER Cisco IOS Smart Install protocol backup config command attempt
- SERVER-OTHER Cisco IOS Smart Install protocol download config command attempt
- SERVER-OTHER Cisco IOS Smart Install protocol download image command attempt
- SERVER-OTHER Cisco IOS Smart Install protocol version command attempt
- ET EXPLOIT Possible CVE-2018-0171 Exploit (PoC based)
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).