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Port 54321 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
54321 tcp trojans opendkim default port (may also use ports 8891,12345)

Trojans using this port:
Schoolbus .69-1.11, 1.6, 2.0 (TCP)
Back Orifice 2000, BO2K(*) (TCP/UDP)

Stack-based buffer overflow in MDMUtil.dll in MDMTool.exe in MDM Tool before 2.3 in Moxa Device Manager allows remote MDM Gateways to execute arbitrary code via crafted data in a session on TCP port 54321.
References: [CVE-2010-4741]

The Terminal Upgrade Tool in the Pilot Below Deck Equipment (BDE) and OpenPort implementations on Iridium satellite terminals allows remote attackers to execute arbitrary code by uploading new firmware to TCP port 54321.
References: [CVE-2014-0327]
54321 udp loadavg UDP port used by "loadavg" - a service that replies with the load average of a machine. SG
54321 tcp trojan Back Orifice 2000, School Bus , yoyo Trojans
54321 tcp,udp BackOrifice2000 [trojan] Back Orifice 2000 SANS
54321 tcp SchoolBus [trojan] School Bus SANS
54321 udp bo2k Back Orifice 2K Default Port Nmap
54321 tcp threat Back Orifice 2000 Bekkoame
54321 udp A service that replies with the load average of a machine. Bekkoame
8 records found
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Related ports: 8891  12345  54320  

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External Resources
SANS Internet Storm Center: port 54321

Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.

TCP ports use the Transmission Control Protocol. TCP is the most commonly used protocol on the Internet and any TCP/IP network. Whereas the IP protocol deals only with packets, TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and that packets will be delivered in the same order in which they were sent. Guaranteed communication/delivery is the key difference between TCP and UDP.

UDP ports use the Datagram Protocol, a communications protocol for the Internet network, transport, and session layers. Like TCP (Transmission Control Protocol), UDP is used with IP (the Internet Protocol) and makes possible the transmission of datagrams from one computer to applications on another computer, but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it's up to the application that received the message to process any errors and verify correct delivery. UDP is often used with time-sensitive applications, such as audio/video streaming, where dropping some packets is preferable to waiting for delayed data.

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