How severe is CVE-2001-0964?

CVE-2001-0964 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2001-0964 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-0964?

CVE-2001-0964 affects Valve Software Half-life. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-0964?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2001-0964 published?

CVE-2001-0964 was published on 2001-09-20 and last updated on 2026-06-16.

CVE-2001-0964

CVE-2001-0964 is a high-severity vulnerability in Valve Software Half-life with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Valve Software Half-life
Published: 2001-09-20
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2001-0964?: 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.
How severe is CVE-2001-0964?: CVE-2001-0964 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2001-0964 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-0964?: CVE-2001-0964 affects Valve Software Half-life. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-0964?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2001-0964 published?: CVE-2001-0964 was published on 2001-09-20 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:valve_software:half-life:*:*:*:*:*:*:*:*

More vulnerabilities in Valve Software Half-life

CVE-2001-0358 — High (CVSS 7.5): Buffer overflows in Sierra Half-Life build 1573 and earlier allow remote attackers to execute arbitrary code via (1) a…
CVE-2004-0724 — Medium (CVSS 5.0): The Half-Life engine before July 7 2004 allows remote attackers to cause a denial of service (server or client crash)…
CVE-2002-0964 — Medium (CVSS 5.0): Half-Life Server 1.1.1.0 and earlier allows remote attackers to cause a denial of service (resource exhaustion) via…

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