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Port 1999 Details

known port assignments and vulnerabilities
threat/application/port search:
Port(s) Protocol Service Details Source
1999 tcp tcp-id-port Cisco identification port.

Some trojans also use this port: Back Door, SubSeven, TransScout
Backdoor.Bifrose.C (05.19.2005) - trojan that opens a backdoor on port 1999/tcp, and sends information to a remote server.

An attacker can identify a CISCO device by sending a SYN packet to port 1999, which is for the Cisco Discovery Protocol (CDP).
References: [CVE-1999-0453]
1999 tcp trojan Back Door, SubSeven , TransScout Trojans
1999 tcp,udp tcp-id-port cisco identification port IANA
1999 tcp BackDoor [trojan] BackDoor SANS
1999 tcp BackDoor [trojan] Back Door SANS
1999 tcp SubSeven [trojan] SubSeven SANS
1999 tcp TransScout [trojan] TransScout SANS
1999 tcp threat Bifrose Bekkoame
8 records found
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Related ports: 2000  

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External Resources
SANS Internet Storm Center: port 1999

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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