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Port 4500 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
4500 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

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

Mac OS X Server VPN service, Back to My Mac (MobileMe, Mac OS X v10.5 or later), Vodafone Sure Signal also use this port.

Abacast peer-to-peer audio and video streaming also uses port 4500 (TCP/UDP)

Unspecified vulnerability in Cisco ASA 5500 Series Adaptive Security Appliance 7.0 and Cisco PIX 500 Series Security Appliance allows remote attackers to cause a denial of service (active IPsec tunnel loss and prevention of new tunnels) via a malformed IKE message through an existing tunnel to UDP port 4500, aka Bug ID CSCtc47782.
References: [CVE-2010-0567], [BID-38279]
4500 udp IPSec NAT Traversal (RFC 3947) (official) Wikipedia
4500 tcp,udp sae-urn SANS
4500 tcp sae-urn sae-urn Nmap
4500 udp nat-t-ike IKE Nat Traversal negotiation (RFC3947) Nmap
4500 tcp,udp sae-urn sae-urn Neophasis
4500 tcp,udp ipsec-nat-t IPsec NAT-Traversal Bekkoame
4500 tcp ipsec-nat-t IPsec NAT-Traversal [RFC8229] , modified: 2017-06-19 IANA
4500 udp ipsec-nat-t IPsec NAT-Traversal [RFC3948][RFC7296] , modified: 2017-07-07 IANA
9 records found
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Related ports: 50  123  500  1701  1723  

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External Resources
SANS Internet Storm Center: port 4500

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.

Please use the "Add Comment" button below to provide additional information or comments about port 4500.
  User Reviews/Comments:
by JSpinks - 2016-02-16 09:07
Additionally newest 10/10 CVE-2016-1287 from Cisco for varying ASA model and ASA enabled devices.

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