What’s Vulnerable › Vulnerabilities

CVE-2001-0004

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 28.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2001-02-12 · updated 2026-06-16

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.

Affected products

• Microsoft Internet Information Server: 4.0
• Microsoft IIS: 5.0

References

• 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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