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Port 8181 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
8181 tcp trojans W32.Erkez.D@mm [Symantec-2004-121413-4703-99] (2004.12.14) - mass mailing worm that can terminate processes, lower security settings, and allow remote access to the compromised computer. Opens a backdoor and listens for remote commands on port 8181/tcp.

Backdoor.Shangxing [Symantec-2007-030516-4150-99] (2007.03.06) also uses this port.

The Web Administrator service (STEMWADM.EXE) in Websense Personal Email Manager 7.1 before Hotfix 4 and Email Security 7.1 before Hotfix 4 allows remote attackers to cause a denial of service (crash) by sending a HTTP GET request to TCP port 8181 and closing the socket before the service can send a response.
References: [CVE-2009-3749], [BID-36740]

IPSwitch IMail is an e-mail server which provides WWW (HTTP) E-mail services. By default this web service resides on port 8181 (TCP/UDP) or 8383 (TCP/UDP). Sending an HTTP request with an extremely long "HOST" field multiple times can cause the system hosting the service to become unresponsive. Each long request "kills" a thread without freeing up the memory used by it. By repeating this request, the system's resources can be used up completely.
References: [BID-2011]

TerraMaster F2-210 devices through 2021-04-03 use UPnP to make the admin web server accessible over the Internet on TCP port 8181, which is arguably inconsistent with the "It is only available on the local network" documentation. NOTE: manually editing /etc/upnp.json provides a partial but undocumented workaround.
References: [CVE-2021-30127]

Intermapper network management system (IANA official)
8181 tcp Zafi.D Zafi.D Backdoor SANS
8181 tcp Erkez.D Erkez.D Backdoor (same as Zafi.D) SANS
8181 tcp pix-devmng Cisco PIX Device Manager SANS
8181 tcp biblioTECH BiblioTECH Library System SANS
8181 tcp,udp threat W32.Erkez Bekkoame
8181 tcp intermapper Intermapper network management system, registered 2011-05-09 IANA
8181 udp Reserved IANA
8150-8350 tcp,udp applications Y-cam Wireless IP Camera Portforward
9 records found
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Related ports: 8383  

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External Resources
SANS Internet Storm Center: port 8181

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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