CVE-1999-1222

Name: CVE-1999-1222
Creator: NVD / NIST
Published: 1999-12-31T05:00:00+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 4.65%

Last modified Jun 16, 2026

CVE-1999-1222 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 4.65% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

4.65%

90.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Microsoft	Windows Nt	4.0

References

http://support.microsoft.com/support/kb/articles/Q188/5/71.ASPPatch, Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/3893
http://support.microsoft.com/support/kb/articles/Q188/5/71.ASPPatch, Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/3893

Timeline

Published: Dec 31, 1999
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-1999-1222?

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.

How severe is CVE-1999-1222?

Severity scoring for CVE-1999-1222 is pending analysis. The EPSS model estimates a 4.65% probability of exploitation in the next 30 days.

How do I fix CVE-1999-1222?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-1999-1222?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST