CVE-1999-1233

NONECVSS 0.0

0.0

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.

CVSS v3: —
EG Score: —
EPSS: 93.3%
KEV: Not listed

Published

December 31, 1999

Last Modified

April 16, 2026

References (8)

cve@mitrehttp://support.microsoft.com/support/kb/articles/Q241/5/62.asp
cve@mitrehttp://www.securityfocus.com/bid/657
cve@mitrehttps://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-039
cve@mitrehttps://exchange.xforce.ibmcloud.com/vulnerabilities/3306
af854a3a-2127-422b-91ae-364da2661108http://support.microsoft.com/support/kb/articles/Q241/5/62.asp
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/657
af854a3a-2127-422b-91ae-364da2661108https://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-039
af854a3a-2127-422b-91ae-364da2661108https://exchange.xforce.ibmcloud.com/vulnerabilities/3306

Data Freshness Timeline

(refreshed 11× in last 7d / 18× 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.

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Frequently asked(4)

What is CVE-1999-1233?

CVE-1999-1233 is a none vulnerability published on December 31, 1999. 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.

When was CVE-1999-1233 disclosed?

CVE-1999-1233 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-1999-1233 actively exploited?

CVE-1999-1233 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 93.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-1999-1233?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-1233, 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.

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CVE-1999-1233

📅 Published

🔄 Last Modified

🔗 References (8)