CVE-2002-0964

Exp

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.

Published: 2002-10-04 Last update: 2026-04-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2002-0964 is rated High Exploit Risk (62.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 3.16%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2002-0964

EDB-ID Source Kind Published Link
21572 exploit_db edb 2002-06-20 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2002-0964

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 6.28% 3.16% -3.13%
2 2025-08-05 4.19% 6.28% +2.10%
3 2025-03-30 — 4.19% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2002-0964

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2002-0964

Affected software / configurations for CVE-2002-0964

Vendor Product Version Raw CPE
valve_software half-life 1.1.0.4 cpe:2.3:a:valve_software:half-life:1.1.0.4:*:linux:*:*:*:*:*
valve_software half-life 1.1.0.4 cpe:2.3:a:valve_software:half-life:1.1.0.4:*:windows:*:*:*:*:*
valve_software half-life 1.1.0.8 cpe:2.3:a:valve_software:half-life:1.1.0.8:*:*:*:*:*:*:*
valve_software half-life 1.1.0.9 cpe:2.3:a:valve_software:half-life:1.1.0.9:*:*:*:*:*:*:*
valve_software half-life 1.1.1.0 cpe:2.3:a:valve_software:half-life:1.1.1.0:*:*:*:*:*:*:*
valve_software half-life_dedicated_server <= 3.1 cpe:2.3:a:valve_software:half-life_dedicated_server:*:*:*:*:*:*:*:*
valve_software half-life_dedicated_server 3.1.3 cpe:2.3:a:valve_software:half-life_dedicated_server:3.1.3:*:*:*:*:*:*:*

References for CVE-2002-0964

cvelogic Threat Intelligence