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Port 1720 Details
known port assignments and vulnerabilities
threat/application/port search:
| Port(s) |
Protocol |
Service |
Details |
Source |
| 1720 |
tcp |
h323 |
Port most commonly used by Microsoft NetMeeting.
H.323 used for voice-over IP call set-up (H.323 Call Control Signalling, IANA official).
IPContact also uses port 1720 (TCP/UDP)
Unspecified vulnerability in the NAT implementation in Cisco IOS 12.1 through 12.4 and 15.0 through 15.1, and IOS XE 3.1.xSG, allows remote attackers to cause a denial of service (device reload) by sending crafted H.323 packets to TCP port 1720, aka Bug ID CSCth11006.
References: [CVE-2011-3277], [BID-49822]
innovaphone is vulnerable to a denial of service. By sending random data to its H.323 network service on the TCP port 1720, a remote attacker could exploit this vulnerability to cause the system to reboot.
References: [XFDB-111292]
An out-of-bounds memory write flaw was found in how the Linux kernel’s Voice Over IP H.323 connection tracking functionality handled connections on ipv6 port 1720. This flaw allows an unauthenticated remote user to crash the system, causing a denial of service. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
References: [CVE-2020-14305] |
SG
|
| 1503, 1720, 5222, 5223, 7640, 7642, 7648, 7649 |
tcp |
applications |
CUseeMe-CUworld |
Portforward
|
| 1720 |
tcp |
applications |
H.323 Call Setup |
Portforward
|
| 1718-1720 |
tcp |
applications |
H.323 GateKeeper |
Portforward
|
| 1720,15328-15333 |
tcp |
applications |
I2Eye DVC-1000-DVC-1100 |
Portforward
|
| 1720,2500,5901,1766-1767 |
tcp |
applications |
IPContact |
Portforward
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| 522,389,1503,1720,1731 |
tcp |
applications |
NetMeeting 2.0 through 3.01 (can also use ports 1024-65535 udp) |
Portforward
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| 1720,5060 |
tcp |
applications |
Polycom ViaVideo H.323 |
Portforward
|
| 1720 |
tcp |
H.323/Q.931 |
Interactive media |
Nmap
|
| 1720 |
tcp,udp |
h323hostcall |
H.323 Call Control Signalling, modified: 2013-01-31 |
IANA
|
| 1720 |
sctp |
h323hostcall |
H.323 Call Control, registered 2014-07-30 |
IANA
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11 records found
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jump to:
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Related ports: 1300 1718 1719 5060 11720
« back to SG Ports
External Resources
SANS Internet Storm Center: port 1720
Notes:
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.
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