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Port 9999 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
9999 tcp trojans Backdoor.Lateda.B (01.17.2005) - backdoor trojan with remote access capabilities. Connects to an IRC server on port 6667, opens a backdoor on port 9999/tcp.

Backdoor.Lateda.C (04.01.2005) - backdoor trojan with remote access capabilities. Connects to an IRC server on the domain on port 5232/tcp, opens a backdoor on port 9999/tcp.

The remote web management interface of Aprelium Technologies Abyss Web Server 1.1.2 and earlier does not log connection attempts to the web management port (9999), which allows remote attackers to mount brute force attacks on the administration console without detection.
References: [CVE-2003-1363] [BID-6842]

Firefly Media Server is vulnerable to a denial of service, caused by multiple NULL pointer dereference errors in the firefly.exe binary file. By sending a specially-crafted packet to TCP Port 9999 with a malformed header, a remote attacker could exploit this vulnerability to cause the application to crash.
References: [EDB-23574]

The Prayer 1 trojan horse also uses port 9999 (TCP).

Football Manager Live (TCP/UDP), Warzone 2100 (TCP/UDP), Ultima Online use this port.
9999 udp infosvr Several Asus router models use a service called infosvr that listens on UDP port 9999 with root privileges and contains unauthenticated command execution vulnerability. See [CVE-2014-9583]

common.c in infosvr in ASUS WRT firmware,, and other versions, as used in RT-AC66U, RT-N66U, and other routers, does not properly check the MAC address for a request, which allows remote attackers to bypass authentication and execute arbitrary commands via a NET_CMD_ID_MANU_CMD packet to UDP port 9999. NOTE: this issue was incorrectly mapped to CVE-2014-10000, but that ID is invalid due to its use as an example of the 2014 CVE ID syntax change.
References: [CVE-2014-9583]
9999 tcp,udp Hydranode - edonkey2000 TELNET control (unofficial) Wikipedia
9999 tcp Lantronix UDS-10/UDS100 RS-485 to Ethernet Converter TELNET control (unofficial) Wikipedia
9999 tcp,udp Urchin Web Analytics (unofficial) Wikipedia
9999 tcp trojan BlitzNet, Oracle, Spadeace Trojans
9999 tcp,udp distinct distinct IANA
9999 tcp ThePrayer [trojan] The Prayer SANS
9990-9999 tcp applications DOT.TUNES Portforward
9920,9995-9999 tcp,udp applications Football Manager Live Portforward
5001-5010, 7775-7777, 7875, 8800-8900, 9999 tcp applications Ultima Online Portforward
9999 tcp,udp applications Warzone 2100 Portforward
9999 tcp abyss Abyss web server remote web management interface Nmap
9999 tcp threat Beasty Bekkoame
9999 tcp threat Lateda Bekkoame
15 records found
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Related ports: 8888  9920  9995  9996  9997  9998  5916  8082  

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External Resources
SANS Internet Storm Center: port 9999

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.

When troubleshooting unknown open ports, it is useful to find exactly what services/processes are listening to them. This can be accomplished in both Windows command prompt and Linux variants using the "netstat -aon" command. We also recommend runnig multiple anti-virus/anti-malware scans to rule out the possibility of active malicious software. For more detailed and personalized help please use our forums.

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