CVE-2000-0457

CVE-2000-0457 is a high-severity vulnerability in Microsoft Internet Information Server with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 53% places it in the 99th percentile, indicating an elevated likelihood of exploitation.

Key facts

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2000-0457?
CVE-2000-0457 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2000-0457 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 53% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2000-0457?
CVE-2000-0457 primarily affects Microsoft Internet Information Server. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2000-0457?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2000-0457 published?
CVE-2000-0457 was published on 2000-05-11 and last updated on 2026-06-16.

References

Affected products (2)

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