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Port 162 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
162 udp SNMP Simple network management protocol (SNMP). Used by various devices and applications (including firewalls and routers) to communicate logging and management information with remote monitoring applications.

Typically, SNMP agents listen on UDP port 161, asynchronous traps are received on port 162.

Format string vulnerability in the snmp_input function in snmptrapd in CMU SNMP utilities (cmu-snmp) allows remote attackers to execute arbitrary code by sending crafted SNMP messages to UDP port 162.
References: [CVE-2006-0250], [BID-16267]

Memory leak in the SNMP process in Cisco IOS XR allows remote attackers to cause a denial of service (memory consumption or process reload) by sending many port-162 UDP packets, aka Bug ID CSCug80345.
References: [CVE-2013-1204]

Cisco Hosted Collaboration Mediation allows remote attackers to cause a denial of service (CPU consumption) via a flood of malformed UDP packets on port 162, aka Bug ID CSCug85756.
References: [CVE-2013-3381]
162 tcp,udp Simple Network Management Protocol Trap (SNMPTRAP) (official) Wikipedia
162 tcp,udp snmptrap SNMPTRAP IANA
162 tcp,udp snmptrap snmp-trap Nmap
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Related ports: 161  

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External Resources
SANS Internet Storm Center: port 162

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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