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CVE-1999-1233

IIS 4.0 does not properly restrict access for the initial session request from a user's IP address if the address does not resolve to a DNS domain, aka the "Domain Resolution" vulnerability.

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

CVSS Metrics

Affected Products (1)

Vendor Product Version
microsoft internet_information_server 4.0

GitHub Security Advisory GHSA-53c2-2qjx-38qh

IIS 4.0 does not properly restrict access for the initial session request from a user's IP...

Risk Scores

CVSS Score 7.5 / 10
EPSS Score 5.45%

Top 8% most likely to be exploited

Threat Score 31.6 / 100

Data Sources

NVD EPSS GitHub