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Port 27015 Details


known port assignments and vulnerabilities
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Port(s) Protocol Service Details Source
27015 tcp steam Port used by Steam servers for online gaming, Half-Life and its mods, such as Counter-Strike.

Empire: Total War, developer: The Creative Assembly
Left 4 Dead, developer: Valve Corporation
Team Fortress 2, developer: Valve
SG
27015 udp applications The SV_CheckForDuplicateNames function in Valve Software Half-Life CSTRIKE Dedicated Server 1.6 and earlier allows remote authenticated users to cause a denial of service (infinite loop and daemon hang) via a backslash character at the end of a connection string to UDP port 27015.
References: [CVE-2006-0734] [BID-16619]

The SV_CheckForDuplicateNames function in Valve Software Half-Life CSTRIKE Dedicated Server 1.1.1.0 and earlier allows remote authenticated users to cause a denial of service (infinite loop and daemon hang) via a certain connection string to UDP port 27015 that represents "absence of player informations," a related issue to CVE-2006-0734.
References: [CVE-2003-1325]
SG
27015 tcp,udp Half-Life and its mods, such as Counter-Strike (unofficial) Wikipedia
27015 udp halflife Half-Life Game Server SANS
1200,27000-27015 udp applications Counter Strike Portforward
27015-27020 udp applications Dark Messiah of Might and Magic Steam Client Portforward
27015 tcp applications Dark Messiah of Might and Magic Steam Client Portforward
1200,27000-27015 udp applications Day of Defeat Source Portforward
6003, 7002, 27010, 27015, 27025 udp applications Half Life Portforward
1200,27000-27015 udp applications Half Life 2 Steam Portforward
27015,27020 udp applications Half Life 2 Steam Server Portforward
1200,27000-27015 udp applications Half Life Steam Portforward
27015,27020 udp applications Half Life Steam Server Portforward
27015 tcp,udp applications Rag Doll Kung Fu Server Portforward
27015 tcp applications Steam Server Portforward
27015 udp halflife Half-life game server Nmap
27010-27344 tcp,udp Unassigned IANA
17 records found
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Related ports: 27017  27020  49181  

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External Resources
SANS Internet Storm Center: port 27015

Notes:
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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