| CVE-2002-0964 | | 0.04 | — | 0.06 | | Oct 4, 2002 | Half-Life Server 1.1.1.0 and earlier allows remote attackers to cause a denial of service (resource exhaustion) via multiple responses to the initial challenge with different cd_key values, which reaches the player limit and prevents other players from connecting until the original responses have timed out. |
| CVE-2004-0724 | | 0.00 | — | 0.01 | | Jul 27, 2004 | The Half-Life engine before July 7 2004 allows remote attackers to cause a denial of service (server or client crash) via an empty fragmented packet. |
| CVE-2001-0964 | | 0.00 | — | 0.01 | | Sep 20, 2001 | Buffer overflow in client for Half-Life 1.1.0.8 and earlier allows malicious remote servers to execute arbitrary code via a long console command. |
| CVE-2001-0358 | | 0.00 | — | 0.03 | | Jun 27, 2001 | Buffer overflows in Sierra Half-Life build 1573 and earlier allow remote attackers to execute arbitrary code via (1) a long map command, (2) a long exec command, or (3) long input in a configuration file. |
