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Port 3306 Details

known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
3306 tcp,udp mysql MySQL database server connections -

Caesar IV game uses this port.

MySQL 5.5.8, when running on Windows, allows remote attackers to cause a denial of service (NULL pointer dereference) via a crafted packet to TCP port 3306.
References: [CVE-2011-5049]

Open Dental 16.1 and earlier has a hardcoded MySQL root password, which allows remote attackers to obtain administrative access by leveraging access to intranet TCP port 3306 (note: the vendor disputes this issue).
See: [CVE-2016-6531]

A vulnerability was found in MariaDB. An OpenVAS port scan on ports 3306 and 4567 allows a malicious remote client to cause a denial of service.
References: [CVE-2023-5157]

Port also used by Nemog backdoor (discovered 2004.08.16) - a backdoor trojan horse that allows an infected computer to be used as an email relay and HTTP proxy, dropped by W32.Mydoom.Q@mm.
It can use one of the following ports: 3306,4242,4646,4661,6565,8080

Worms using this port: W32.Spybot.IVQ [Symantec-2005-012715-3315-99]
3306 tcp,udp MySQL database system (official) Wikipedia
3306 tcp applications Caesar IV Portforward
3306 tcp,udp applications MySQL Server Portforward
1221,3306,3690 tcp,udp applications SAM2 Broadcaster Portforward
3306 tcp mysql mySQL Nmap
3306 tcp threat Nemog Bekkoame
3306 tcp threat W32.Spybot Bekkoame
3306 tcp,udp mysql MySQL IANA
3224-3324 udp citrix Citrix NetScaler Gateway XenDesktop–Virtual Desktop/XenApp Worker Server uses port range 3224-3324 UDP for access to applications and virtual desktops with Framehawk. SG
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Related ports: 4242  4567  4646  4661  6565  8080  

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External Resources
SANS Internet Storm Center: port 3306

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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