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Vulnerability record · CVE-2000-0258 · published 12 April 2000

CVE-2000-0258: Microsoft internet information server improper input validation vulnerability

Microsoft · Internet Information Server

IIS 4.0 and 5.0 allows remote attackers to cause a denial of service by sending many URLs with a large number of escaped characters, aka the "Myriad Escaped Characters" Vulnerability.

7.5 CVSS 3.0 High EPSS 19% · top 2.7% CWE-20 · Improper input validation
7.5CVSS 3.0 base score, v2 5.0
19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
16 Jun 2026Last modified by NVD

Description

IIS 4.0 and 5.0 allows remote attackers to cause a denial of service by sending many URLs with a large number of escaped characters, aka the "Myriad Escaped Characters" Vulnerability.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/1101 Third Party AdvisoryVDB Entry
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2000/ms00-023
http://www.securityfocus.com/bid/1101 Third Party AdvisoryVDB Entry
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2000/ms00-023

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2000-0258), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.