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Port 1723 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
1723 tcp,udp PPTP PPTP VPN (Point-to-Point Tunneling Protocol Virtual Private Networking). For additional information, see the MS VPN FAQ.

See also:
port 500/udp (IPSec IKE)
port 1701/tcp (L2TP)

Mac OS X Server VPN service also uses port 1723 (TCP).

The Siemens Gigaset SE361 WLAN router allows remote attackers to cause a denial of service (device reboot) via a flood of crafted TCP packets to port 1723.
References: [CVE-2009-3322] [BID-36366]

SMC Networks Barricade Wireless Cable/DSL Broadband Router SMC7004VWBR allows remote attackers to cause a denial of service via certain packets to PPTP port 1723 on the internal interface.
References: [CVE-2003-0419]

The PPTP implementation in Cisco IOS 12.2 and 15.0 through 15.3, when NAT is used, allows remote attackers to cause a denial of service (device reload) via crafted TCP port-1723 packets, aka Bug ID CSCtq14817.
References: [CVE-2013-5481]
1723 tcp,udp Microsoft Point-to-Point Tunneling Protocol (PPTP) (official) Wikipedia
1723 tcp,udp pptp pptp IANA
1723 tcp pptp Point-to-point tunnelling protocol SANS
1723 udp pptp pptp SANS
1723 tcp applications Point-to-Point Tunneling Protocol Portforward
1723 tcp pptp Point-to-point tunnelling protocol Nmap
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Related ports: 500  1701  4500  

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External Resources
SANS Internet Storm Center: port 1723

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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