How severe is CVE-2001-0909?

CVE-2001-0909 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2001-0909 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 18% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-0909?

CVE-2001-0909 affects Microsoft Windows Xp. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-0909?

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-2001-0909 published?

CVE-2001-0909 was published on 2001-11-21 and last updated on 2026-06-16.

CVE-2001-0909

CVE-2001-0909 is a high-severity vulnerability in Microsoft Windows Xp with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 18% places it in the 97th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 18% (97th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Windows Xp
Published: 2001-11-21
Last modified: 2026-06-16

Description

Buffer overflow in helpctr.exe program in Microsoft Help Center for Windows XP allows remote attackers to execute arbitrary code via a long hcp: URL.

Frequently asked questions

What is CVE-2001-0909?: Buffer overflow in helpctr.exe program in Microsoft Help Center for Windows XP allows remote attackers to execute arbitrary code via a long hcp: URL.
How severe is CVE-2001-0909?: CVE-2001-0909 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2001-0909 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 18% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-0909?: CVE-2001-0909 affects Microsoft Windows Xp. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-0909?: 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-2001-0909 published?: CVE-2001-0909 was published on 2001-11-21 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:o:microsoft:windows_xp:*:gold:*:*:*:*:*:*

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