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Port 1812 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
1812 udp RADIUS RADIUS (Remote Authentication Dial-In User Service, RFC 2865 and RFC 2866 ) is a freely available distributed security system developed by Lucent Technologies InterNetworking Systems. Lucent has worked with the IETF (Internet Engineering Task Force) to define RADIUS as an interoperable method for distributed security on the Internet. RADIUS was designed based on a previous recommendation from the IETF's Network Access Server Working Requirements Group.

Uses UDP ports 1645 & 1646, or 1812 & 1813.

A vulnerability has been reported in Cisco Secure Access Control Server, which can be exploited by malicious people to compromise a vulnerable system. The vulnerability is caused due to an error when parsing EAP-FAST user identities and can be exploited to execute arbitrary commands via specially crafted packets sent to UDP port 1645 or 1812.
References: [CVE-2013-3466], [SECUNIA-54610]
1812 tcp applications RADIUS authentication protocol default port.

The default configuration of Apache Tomcat in Websense Manager in Websense Web Security 7.0 and Web Filter 7.0 allows connections to TCP port 1812 from arbitrary source IP addresses, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via UTF-7 text to the 404 error page of a Project Woodstock service on this port.
References: [CVE-2009-5120]

RADIUS authentication protocol [RFC 2138] (IANA official)
1812 tcp,udp radius, RADIUS authentication protocol (official) Wikipedia
1414, 1424, 1812, 1813, 7648, 24032, 56800 udp applications CUseeMe-CUworld Portforward
1812 udp radius RADIUS authentication protocol (RFC 2138) Nmap
1812 tcp,udp radius RADIUS [RFC2865] IANA
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Related ports: 1645  1646  1813  49  

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External Resources
SANS Internet Storm Center: port 1812

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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