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Port 500 Details


known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
500 tcp,udp ipsec IPSec (VPN tunneling) uses the following ports:

50 - Encapsulation Header (ESP)
51 - Authentication Header (AH)
500/udp - Internet Key Exchange (IKE)
4500/udp - NAT traversal

500/tcp - sometimes used for IKE over TCP

See also:
port 1701 (L2TP)
port 1723 (PPTP)

Some Apple applications use this port as well: Mac OS X Server VPN service, Back to My Mac (MobileMe, Mac OS X v10.5 or later).

isakmp_sub_print in tcpdump 3.6 through 3.7.1 allows remote attackers to cause a denial of service (CPU consumption) via a certain malformed ISAKMP packet to UDP port 500, which causes tcpdump to enter an infinite loop.
References: [CVE-2003-0108] [BID-6974]

Microsoft Windows XP allows remote attackers to cause a denial of service (CPU consumption) by flooding UDP port 500 (ISAKMP).
References: [CVE-2002-2117]

Snapgear Lite+ firewall 1.5.3 allows remote attackers to cause a denial of service (IPSEC crash) via a zero length packet to UDP port 500.
References: [CVE-2002-0603] [BID-4659]

Vodafone Sure Signal also uses this port
SG
500 udp Internet Security Association and Key Management Protocol (ISAKMP) (official) Wikipedia
500 tcp,udp isakmp isakmp IANA
500 tcp,udp isakmp VPN Key Exchange SANS
500 tcp,udp applications Bay VPN Portforward
500 udp threat Cisco Systems Bekkoame
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Related ports: 50  123  259  264  1701  1723  4500  

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External Resources
SANS Internet Storm Center: port 500

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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