CVE-1999-1222

NONECVSS 0.0

0.0

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.

CVSS v3: —
EG Score: —
EPSS: 93.0%
KEV: Not listed

Published

December 31, 1999

Last Modified

April 16, 2026

References (4)

cve@mitrehttp://support.microsoft.com/support/kb/articles/Q188/5/71.ASP
cve@mitrehttps://exchange.xforce.ibmcloud.com/vulnerabilities/3893
af854a3a-2127-422b-91ae-364da2661108http://support.microsoft.com/support/kb/articles/Q188/5/71.ASP
af854a3a-2127-422b-91ae-364da2661108https://exchange.xforce.ibmcloud.com/vulnerabilities/3893

Data Freshness Timeline

(refreshed 11× in last 7d / 17× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-29 13:40 UTCepss_batch
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Frequently asked(4)

What is CVE-1999-1222?

CVE-1999-1222 is a none vulnerability published on December 31, 1999. 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.

When was CVE-1999-1222 disclosed?

CVE-1999-1222 was first published in the National Vulnerability Database on December 31, 1999, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-1999-1222 actively exploited?

CVE-1999-1222 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 93.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-1999-1222?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-1222, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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Frequently asked(4)

What is CVE-1999-1222?

When was CVE-1999-1222 disclosed?

Is CVE-1999-1222 actively exploited?

How do I remediate CVE-1999-1222?

CVE-1999-1222

📅 Published

🔄 Last Modified

🔗 References (4)

Data Freshness Timeline

❓ Frequently asked(4)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-1999-1222?

CVE-1999-1222

📅 Published

🔄 Last Modified

🔗 References (4)

Data Freshness Timeline

❓ Frequently asked(4)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-1999-1222?

Published

Last Modified

References (4)

Frequently asked(4)

Published

Last Modified

References (4)

Frequently asked(4)