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CVE-2000-0457

ISM.DLL in IIS 4.0 and 5.0 allows remote attackers to read file contents by requesting the file and appending a large number of encoded spaces (%20) and terminated with a .htr extension, aka the ".HTR File Fragment Reading" or "File Fragment Reading via .HTR" vulnerability.

Published: May 11, 2000 Modified: Apr 16, 2026

CVSS Metrics

Affected Products (2)

Vendor Product Version
microsoft internet_information_server 4.0
microsoft internet_information_services 5.0

GitHub Security Advisory GHSA-w5j6-fmxr-5fr8

ISM.DLL in IIS 4.0 and 5.0 allows remote attackers to read file contents by requesting the file...

Risk Scores

CVSS Score 7.5 / 10
EPSS Score 84.39%

Top 1% most likely to be exploited

Threat Score 65.3 / 100

Data Sources

NVD EPSS GitHub