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Port 520 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
520 udp router RIP (Routing Information Protocol). Routers use RIP in order to advertise routing information to each other and communicate optimal paths.

References: [RFC 1058] & [RFC 2453]

Cisco NX-OS is vulnerable to a denial of service, caused by an error in the Routing Information Protocol (RIP) service engine. By sending a specially-crafted RIPv4 or RIPv6 message to UDP port 520, a remote attacker could exploit this vulnerability to cause the RIP service engine to restart.
References: [CVE-2012-4091] [XFDB-87669] [BID-62838]

A UDP backdoor also uses this port.
520 tcp efs ISC DHCP server 4.2 before 4.2.0-P2, when configured to use failover partnerships, allows remote attackers to cause a denial of service (communications-interrupted state and DHCP client service loss) by connecting to a port that is only intended for a failover peer, as demonstrated by a Nagios check_tcp process check to TCP port 520.
References: [CVE-2010-3616], [BID-45360]

Port IANA registered for Extended File Name Server
520 tcp efs, extended file name server (official) Wikipedia
520 udp Routing - RIP (official) Wikipedia
520 udp trojan A UDP backdoor Trojans
520 udp route router routed -- RIP SANS
520 udp route router routed -- RIP Nmap
520 tcp efs extended file name server IANA
520 udp router local routing process (on site); uses variant of Xerox NS routing information protocol - RIP IANA
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External Resources
SANS Internet Storm Center: port 520

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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