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Vulnerability record · CVE-1999-1222 · published 31 December 1999

CVE-1999-1222: Microsoft windows nt vulnerability

Microsoft · Windows Nt

Netbt.sys in Windows NT 4.0 allows remote malicious DNS servers to cause a denial of service (crash) by returning 0.0.0.0 as the IP address for a DNS host name lookup.

5.0 CVSS 2.0 Medium EPSS 5.0% · top 8.0%
5.0CVSS 2.0 base score
5.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
16 Jun 2026Last modified by NVD

Description

Netbt.sys in Windows NT 4.0 allows remote malicious DNS servers to cause a denial of service (crash) by returning 0.0.0.0 as the IP address for a DNS host name lookup.

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

Affected products

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

References

LinkTags
http://support.microsoft.com/support/kb/articles/Q188/5/71.ASP PatchVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/3893
http://support.microsoft.com/support/kb/articles/Q188/5/71.ASP PatchVendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/3893

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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-1999-1222), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.