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Port 22 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
22 udp ssh The Secure Shell (SSH) Protocol [RFC 4251]

Old verson of pcAnywhere uses port 22/udp (no relation to ssh and port 22/tcp).
The real pcAnywhere port is 5632. The value 0x0016 (hex) is 22 decimal; the value of 0x1600 (hex) is 5632 decimal. Some say that pcAnywhere had a byte-swapping bug that led to its incorrect use of port 22.
22 tcp,sctp SSH Secure Shell - most common use is command line access, secure replacement of Telnet. Could also be used as an encrypted tunnel for secure communication of virtually any service [RFC 4251], [RFC 4960]

freeSSHd 1.2 and earlier allows remote attackers to cause a denial of service (crash) via a SSH2_MSG_NEWKEYS packet to TCP port 22, which triggers a NULL pointer dereference.
References: [CVE-2008-0852] [BID-27845] [SECUNIA-29002]

The SSH service on Dell PowerConnect 3348, 3524p, and 5324 switches allows remote attackers to cause a denial of service (device reset) or possibly execute arbitrary code by sending many packets to TCP port 22.
References: [CVE-2013-3594], [XFDB-90595], [BID-65070]

RUCKUS could allow a remote attacker to bypass security restrictions. An unauthenticated remote attacker with network access to port 22 can tunnel random TCP traffic to other hosts on the network via Ruckus devices. A remote attacker could exploit this vulnerability to bypass security restrictions and gain unauthorized access to the vulnerable application.
References: [XFDB-84626]

360 Systems contains a default hard-coded password in the image server series. By logging into the device via TCP port 22, a remote attacker could gain root privileges on the system to modify or upload video to play immediately and affect the emergency broadcast system in the United States.
References: [XFDB-82650], [BID-58338], [CVE-2012-4702]

Some trojans also use this port: InCommand, Shaft, Skun
22 tcp,udp Secure Shell (SSH) - used for secure logins, file transfers (scp, sftp) and port forwarding (official) Wikipedia
22 tcp trojan InCommand, Shaft, Skun Trojans
22 tcp,udp ssh SSH Remote Login Protocol [RFC4960] IANA
22 tcp,udp ssh SSH Remote Login Protocol SANS
22,57,80,3660,3663,4665 tcp,udp applications AudioReQuest Portforward
22 tcp,udp applications iGet Portforward
22 tcp,udp applications Networdz Portforward
22 tcp,udp applications SSH Portforward
22,2992,3670 tcp,udp applications VideoReQuest Portforward
22 tcp,udp ssh Secure Shell Login Nmap
22 tcp Adoresshd [trojan] Adore sshd Neophasis
22 tcp Shaft [trojan] Shaft Neophasis
22 udp pcanywhere PCAnywhere (deprecated) Neophasis
22 tcp threat Shaft Bekkoame
22 udp pcAnywhere(Used in older versions, though newer version still use it for backwards compatibility.) Bekkoame
17 records found
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Related ports: 8143  

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External Resources
SANS Internet Storm Center: port 22

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.

Please use the "Add Comment" button below to provide additional information or comments about port 22.
  User Reviews/Comments:
by Matt Clairmont - 2014-02-06 14:01
Qakbot trojan uses port 21/tcp to exfiltrate data from the host through sec*.kcb files.
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