Half-Life Server multiple player denial of service

halflife-multiple-player-dos (9412) The risk level is classified as MediumMedium Risk


Valve Software's Half-Life Server is vulnerable to a denial of service attack. Normally, a single cd key allows for a maximum of four players from the same server. However, a remote attacker could send a connection request with a specially-crafted %cd_key parameter, which would allow the attacker to create new players above the four player limit until the maximum amount of players allowed for that game server has been reached. Once this occurs, legitimate users would be unable to connect to the game server.


Denial of Service


No remedy available as of September 1, 2014.


Platforms Affected:

  • Sierra Half-Life Dedicated Server
  • Sierra Half-Life Server


Jun 20, 2002

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