How severe is CVE-1999-1234?

CVE-1999-1234 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-1999-1234 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1234?

CVE-1999-1234 affects Microsoft Windows Nt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-1999-1234?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-1999-1234 published?

CVE-1999-1234 was published on 1999-10-26 and last updated on 2026-06-16.

CVE-1999-1234

CVE-1999-1234 is a medium-severity vulnerability in Microsoft Windows Nt with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 13% places it in the 96th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 13% (96th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Windows Nt
Published: 1999-10-26
Last modified: 2026-06-16

Description

LSA (LSASS.EXE) in Windows NT 4.0 allows remote attackers to cause a denial of service via a NULL policy handle in a call to (1) SamrOpenDomain, (2) SamrEnumDomainUsers, and (3) SamrQueryDomainInfo.

Frequently asked questions

What is CVE-1999-1234?: LSA (LSASS.EXE) in Windows NT 4.0 allows remote attackers to cause a denial of service via a NULL policy handle in a call to (1) SamrOpenDomain, (2) SamrEnumDomainUsers, and (3) SamrQueryDomainInfo.
How severe is CVE-1999-1234?: CVE-1999-1234 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-1999-1234 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 13% (96th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1234?: CVE-1999-1234 affects Microsoft Windows Nt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-1999-1234?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-1234 published?: CVE-1999-1234 was published on 1999-10-26 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:o:microsoft:windows_nt:4.0:*:*:*:*:*:*:*

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