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Port 67 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
67 udp bootp server Bootstrap protocol server. Used by DHCP servers to communicate addressing information to remote DHCP clients [RFC 951]

NCP Secure Enterprise Client (aka VPN/PKI client) 8.30 Build 59, and possibly earlier versions, when the Link Firewall and Personal Firewall are both configured to block all inbound and outbound network traffic, allows context-dependent attackers to send inbound UDP traffic with source port 67 and destination port 68, and outbound UDP traffic with source port 68 and destination port 67.
References: [CVE-2006-3551]

ZoneAlarm 2.1.10 and earlier does not filter UDP packets with a source port of 67, which allows remote attackers to bypass the firewall rules.
References: [CVE-2000-0339] [BID-1137] [OSVDB-1294]

Apple NetBoot also uses this port.
67 tcp applications Falco LX-4PRO SG
67 udp Bootstrap Protocol (BOOTP) Server; also used by Dynamic Host Configuration Protocol (DHCP) (official) Wikipedia
67 tcp,udp dhcps DHCP/Bootstrap Protocol Server Nmap
67 tcp bootps Bootstrap Protocol Server [RFC951] IANA
67 udp bootps Bootstrap Protocol Server IANA
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Related ports: 68  

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External Resources
SANS Internet Storm Center: port 67

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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