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Port 3389 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
3389 tcp rdp Port is IANA registered for Microsoft WBT Server, used for Windows Remote Desktop and Remote Assistance connections (RDP - Remote Desktop Protocol). Also used by Windows Terminal Server.

See also: MS Security Bulletin [MS02-051] and [MS01-040].

Trojans using this port: Backdoor.Win32.Agent.cdm, TSPY_AGENT.ADDQ

This port is vulnerable to Denial of Service Attack Against Windows NT Terminal Server. A remote attacker can quickly cause a server to reach full memory utilization by creating a large number of normal TCP connections to port 3389. Individual connections will timeout, but a low bandwidth
continuous attack will maintain a terminal server at maximum memory utilization and prevent new connections from a legitimate source from taking place. Legitimate new connections will fail at this point with an error of either a connection timeout, or the terminal server has ended the connection.
References: [CVE-1999-0680]

A vulnerability exists in the Remote Desktop Protocol (RDP), where an attacker could send a specially crafted sequence of packets to TCP port 3389 which can result in RDP to accessing an object in memory after it has been deleted.
References: [CVE-2012-2526]

Zmodo Geovision also uses port 3389 (TCP/UDP)
3389 tcp Microsoft Terminal Server (RDP) officially registered as Windows Based Terminal (WBT) (unofficial) Wikipedia
3389 tcp,udp ms-wbt-server MS WBT Server IANA
3389 tcp,udp ms-term-services MS Terminal Services SANS
21, 80, 3389, 4550, 5550, 6550, 9650 tcp applications GeoVision TwinDVR with Webcam Portforward
21,80,3389,4550,5550,6550 tcp applications GeoVision Webcam Portforward
3389 tcp,udp applications Remote Desktop Portforward
3389 tcp applications Terminal Services Portforward
3389 tcp,udp applications Windows 2000 Terminal Server Portforward
3389 tcp,udp ms-term-serv Microsoft Remote Display Protocol Nmap
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External Resources
SANS Internet Storm Center: port 3389

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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