TCP Port 55443

About TCP Port 55443

Port 55443 has no formal IANA registration. This port falls within the dynamic/private port range, which IANA explicitly does not register; these ports are intended for ephemeral or temporary use. It is referenced in 3 IDS rules but does not exhibit malware activity indicators in our data.

IDS Rule References

3 IDS / security rules reference TCP port 55443. 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): successful-admin (2), attempted-admin (1).

Sample rule descriptions for TCP port 55443:

• ET EXPLOIT Possible Cisco REST API Container for Cisco IOS XE Software Authentication Bypass Attempt (CVE-2019-12643)
• ET EXPLOIT Cisco REST API Container for Cisco IOS XE Software Authentication Bypass – Successful Exploit (CVE-2019-12643)
• ET EXPLOIT Cisco REST API Container for Cisco IOS XE Software Authentication Bypass – Token Usage (CVE-2019-12643)

Data Sources

This information is compiled from: Emerging Threats Open Ruleset (BSD 2-Clause / GPLv2 per SID range).