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Vulnerability record · CVE-1999-0721 · published 20 July 1999

CVE-1999-0721: Microsoft windows 2000 improper input validation vulnerability

Microsoft · Windows 2000

Denial of service in Windows NT Local Security Authority (LSA) through a malformed LSA request.

7.8 CVSS 2.0 High EPSS 8.5% · top 5.2% CWE-20 · Improper input validation
7.8CVSS 2.0 base score
8.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
16 Jun 2026Last modified by NVD

Description

Denial of service in Windows NT Local Security Authority (LSA) through a malformed LSA request.

AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ231457
http://www.ciac.org/ciac/bulletins/j-049.shtml
https://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-020
http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ231457
http://www.ciac.org/ciac/bulletins/j-049.shtml
https://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-020

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-1999-0721), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.