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Vulnerability record · CVE-2001-0004 · published 12 February 2001

CVE-2001-0004: Microsoft internet information server vulnerability

Microsoft · Internet Information Server

IIS 5.0 and 4.0 allows remote attackers to read the source code for executable web server programs by appending "%3F+.htr" to the requested URL, which causes the files to be parsed by the .HTR ISAPI extension, aka a variant of the "File Fragment Reading via .HTR" vulnerability.

5.0 CVSS 2.0 Medium EPSS 28% · top 1.9%
5.0CVSS 2.0 base score
28%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References
16 Jun 2026Last modified by NVD

Description

IIS 5.0 and 4.0 allows remote attackers to read the source code for executable web server programs by appending "%3F+.htr" to the requested URL, which causes the files to be parsed by the .HTR ISAPI extension, aka a variant of the "File Fragment Reading via .HTR" vulnerability.

AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

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

References

LinkTags
http://marc.info/?l=bugtraq&m=97897954625305&w=2
http://www.securityfocus.com/bid/2313
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-004
https://exchange.xforce.ibmcloud.com/vulnerabilities/5903
http://marc.info/?l=bugtraq&m=97897954625305&w=2
http://www.securityfocus.com/bid/2313
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-004
https://exchange.xforce.ibmcloud.com/vulnerabilities/5903

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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-2001-0004), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.