Summary
generated automatically from NVD dataCVE-1999-1222 affects Netbt.sys in Microsoft Windows NT 4.0. A remote malicious DNS server can crash the system by answering a DNS host name lookup with 0.0.0.0 as the IP address, causing a denial of service. The flaw is exploitable over the network without authentication and impacts only availability, and it carries a CVSS v2.0 score of 5.0 (MEDIUM).
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.
EPSS · FIRST.org
5.0%probability of exploitation in the next 30 days
Higher than 92% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-30, recomputed daily by FIRST.org.
CVSS v2.0 Score
Information
- Published
- 31 déc. 1999
- Updated
- 16 juin 2026
- Status
- Modified
- Source
- cve@mitre.org
Affected products
Bounds published by NVD: "< 8.4.27" means 8.4.27 is no longer vulnerable. The fixed release to install is in the vendor advisory.
Weaknesses (CWE)
Similar CVEs
Other vulnerabilities of type
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