What is CVE-1999-1234?

CVE-1999-1234 is a vulnerability in Microsoft Windows Nt. Published 1999-10-26.

Is CVE-1999-1234 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Microsoft Windows Nt

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.

Published 1999-10-26 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 5.0 (Medium). Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.135 (96.3th percentile), scored 2026-09-29.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.135 · newest: 0.135 · change: 0.000

Affected products

Microsoft Windows Nt — versions 4.0

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

marc.info/ (mailing-list)
exchange.xforce.ibmcloud.com/vulnerabilities/3293 (vdb-entry)

Frequently asked questions

What is CVE-1999-1234?: CVE-1999-1234 is a vulnerability in Microsoft Windows Nt. Published 1999-10-26.
Is CVE-1999-1234 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.