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Port 8081 Details


known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
8081 tcp http Hyper Text Transfer Protocol (HTTP) - alternative ports used for web traffic. See also TCP ports 80, 81, 8080.

Dreambox 8000 also uses port 8081 (TCP/UDP).

If you're not running web services on this ports, keep in mind that some trojans also use it:
W32.Bufei (04.18.2005) - virus with backdoor and keylogger capabilities. Attempts to connect to URLs for remote access on port 8081 every 3 minutes.

A vulnerability has been reported in McAfee Agent, which can be exploited by malicious people to cause a DoS (Denial of Service). The vulnerability is caused due to an unspecified error within the McAfee Framework Service (FrameworkService.exe) when handling HTTP requests and can be exploited to cause a crash by sending a specially crafted HTTP request to default TCP port 8081.
References: [CVE-2013-3627], [SECUNIA-55158]
SG
8081 tcp HTTP alternate, e.g. McAfee ePolicy Orchestrator (ePO) (unofficial) Wikipedia
8081 tcp,udp sunproxyadmin Sun Proxy Admin Service IANA
8081 tcp blackice BlackICE ICEcap SANS
8081 tcp blackice-icecap ICECap user console Nmap
8081 tcp nai-epolicy NAI McAfee EPO ePolicy Orchestrator HTTP Neophasis
8081 tcp threat Danmec Bekkoame
8081 tcp threat W32.Bufei Bekkoame
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Related ports: 80  591  8008  8009  8080  8443  

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External Resources
SANS Internet Storm Center: port 8081

Notes:
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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