CVE-2000-0408

NONECVSS 0.0Weaponized

0.0

IIS 4.05 and 5.0 allow remote attackers to cause a denial of service via a long, complex URL that appears to contain a large number of file extensions, aka the "Malformed Extension Data in URL" vulnerability.

CVSS v3: —
EG Score: —
EPSS: 98.9%
KEV: Not listed

Published

May 11, 2000

Last Modified

April 16, 2026

References (8)

cve@mitrehttp://www.microsoft.com/technet/support/kb.asp?ID=260205
cve@mitrehttp://www.securityfocus.com/bid/1190
cve@mitrehttp://www.ussrback.com/labs40.html
cve@mitrehttps://docs.microsoft.com/en-us/security-updates/securitybulletins/2000/ms00-030
af854a3a-2127-422b-91ae-364da2661108http://www.microsoft.com/technet/support/kb.asp?ID=260205
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/1190
af854a3a-2127-422b-91ae-364da2661108http://www.ussrback.com/labs40.html
af854a3a-2127-422b-91ae-364da2661108https://docs.microsoft.com/en-us/security-updates/securitybulletins/2000/ms00-030

Data Freshness Timeline

(refreshed 6× in last 7d / 10× 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
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-24 16:42 UTCepss_batch
2026-05-21 22:38 UTCepss_batch
2026-05-20 22:36 UTCepss_batch
2026-05-18 21:29 UTCepss_batch
2026-05-18 21:29 UTCepss_batch

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-19907✓ verified
First seen May 11, 2000
Microsoft IIS 4.0/5.0 - Malformed File Extension Denial of Service
Open source ↗

Frequently asked(4)

What is CVE-2000-0408?

CVE-2000-0408 is a none vulnerability published on May 11, 2000. IIS 4.05 and 5.0 allow remote attackers to cause a denial of service via a long, complex URL that appears to contain a large number of file extensions, aka the "Malformed Extension Data in URL" vulnerability.

When was CVE-2000-0408 disclosed?

CVE-2000-0408 was first published in the National Vulnerability Database on May 11, 2000, 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-2000-0408 actively exploited?

CVE-2000-0408 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 98.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-2000-0408?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2000-0408, 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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CVE-2000-0408

📅 Published

🔄 Last Modified

🔗 References (8)