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Port 5500 Details


known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
5500 tcp,udp fcp-addr-srvr1 HotLine peer-to-peer file sharing, Virtual Network Computing (VNC), Tight VNC

Proxy.exe in DualDesk 20 allows Remote Denial Of Service (daemon crash) via a long string to TCP port 5500.
References: [CVE-2018-7583], [EDB-44222]

A vulnerability in the Easy Virtual Switching System (VSS) feature of Cisco IOS XE Software for Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches could allow an unauthenticated, remote attacker to execute arbitrary code on the underlying Linux operating system of an affected device. The vulnerability is due to incorrect boundary checks of certain values in Easy VSS protocol packets that are destined for an affected device. An attacker could exploit this vulnerability by sending crafted Easy VSS protocol packets to UDP port 5500 while the affected device is in a specific state. When the crafted packet is processed, a buffer overflow condition may occur. A successful exploit could allow the attacker to trigger a denial of service (DoS) condition or execute arbitrary code with root privileges on the underlying Linux operating system of the affected device.
References: [CVE-2021-1451]

fcp-addr-srvr1 (IANA official)
SG
5500 tcp VNC remote desktop protocol - for incoming listening viewer, Hotline control connection (unofficial) Wikipedia
5500 tcp hotline Hotline server SANS
5500 udp securid SecurID SANS
5500-5503 tcp applications Hotline Server Portforward
950,5500-5699,13000-14000 tcp applications MOHAA MatchWatch Portforward
5500-5699 tcp applications MOHAA Reverend Portforward
5500 tcp applications Remote Support System Portforward
5800,5500,5900 tcp applications Tight VNC Portforward
5500,5800,5900 tcp applications Vitual Network Computing Portforward
5500,5800,5900 tcp applications VNC Portforward
5500 tcp hotline Hotline file sharing client/server Nmap
5500 udp securid SecurID Nmap
5500 udp threat SecurID ACE (Access Control) server Bekkoame
5500 tcp,udp fcp-addr-srvr1 fcp-addr-srvr1 IANA
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Related ports: 5501  5502  5503  5504  5800  5900  

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External Resources
SANS ISC: port 5500

Notes:
Port numbers in computer networking represent communication endpoints. Ports are unsigned 16-bit integers (0-65535) that identify a specific process, or network service. IANA is responsible for internet protocol resources, including the registration of commonly used port numbers for well-known internet services.
Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.

TCP ports use the Transmission Control Protocol, the most commonly used protocol on the Internet and any TCP/IP network. 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. Like TCP, UDP is used in combination with IP (the Internet Protocol) and facilitates 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 and realtime gaming, 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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