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.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Half-life | Valve_software | 1.1.0.4 (including) | 1.1.0.4 (including) |
| Half-life | Valve_software | 1.1.0.8 (including) | 1.1.0.8 (including) |
| Half-life | Valve_software | 1.1.0.9 (including) | 1.1.0.9 (including) |
| Half-life | Valve_software | 1.1.1.0 (including) | 1.1.1.0 (including) |
| Half-life_dedicated_server | Valve_software | * | 3.1 (including) |
| Half-life_dedicated_server | Valve_software | 3.1.3 (including) | 3.1.3 (including) |