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Vulnerability record · CVE-1999-0995 · published 16 December 1999

CVE-1999-0995: Microsoft windows nt improper input validation vulnerability

Microsoft · Windows Nt

Windows NT Local Security Authority (LSA) allows remote attackers to cause a denial of service via malformed arguments to the LsaLookupSids function which looks up the SID, aka "Malformed Security Identifier Request."

7.8 CVSS 2.0 High EPSS 22% · top 2.4% CWE-20 · Improper input validation
7.8CVSS 2.0 base score
22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
16 Jun 2026Last modified by NVD

Description

Windows NT Local Security Authority (LSA) allows remote attackers to cause a denial of service via malformed arguments to the LsaLookupSids function which looks up the SID, aka "Malformed Security Identifier Request."

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

Affected products

1 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%3BQ248185
http://www.securityfocus.com/bid/875
https://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-057
http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ248185
http://www.securityfocus.com/bid/875
https://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-057

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

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Source: NIST National Vulnerability Database (record CVE-1999-0995), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.