How severe is CVE-1999-0581?

CVE-1999-0581 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-1999-0581 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0581?

CVE-1999-0581 affects Microsoft Windows Nt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-1999-0581?

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

When was CVE-1999-0581 published?

CVE-1999-0581 was published on 1999-01-01 and last updated on 2026-06-16.

CVE-1999-0581

CVE-1999-0581 is a critical-severity vulnerability in Microsoft Windows Nt with a CVSS 2.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 7% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Windows Nt
Published: 1999-01-01
Last modified: 2026-06-16

Description

The HKEY_CLASSES_ROOT key in a Windows NT system has inappropriate, system-critical permissions.

Frequently asked questions

What is CVE-1999-0581?: The HKEY_CLASSES_ROOT key in a Windows NT system has inappropriate, system-critical permissions.
How severe is CVE-1999-0581?: CVE-1999-0581 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-1999-0581 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0581?: CVE-1999-0581 affects Microsoft Windows Nt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-1999-0581?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-1999-0581 published?: CVE-1999-0581 was published on 1999-01-01 and last updated on 2026-06-16.

References

https://www.cve.org/CVERecord?id=CVE-1999-0581

Affected products (1)

cpe:2.3:o:microsoft:windows_nt:*:*:*:*:*:*:*:*

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