How severe is CVE-2001-0545?

CVE-2001-0545 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2001-0545 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 18% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-0545?

CVE-2001-0545 affects Microsoft Internet Information Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-0545?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2001-0545 published?

CVE-2001-0545 was published on 2001-10-30 and last updated on 2026-06-16.

CVE-2001-0545

CVE-2001-0545 is a medium-severity vulnerability in Microsoft Internet Information Server with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 18% places it in the 97th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 18% (97th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Internet Information Server
Published: 2001-10-30
Last modified: 2026-06-16

Description

IIS 4.0 with URL redirection enabled allows remote attackers to cause a denial of service (crash) via a malformed request that specifies a length that is different than the actual length.

Frequently asked questions

What is CVE-2001-0545?: IIS 4.0 with URL redirection enabled allows remote attackers to cause a denial of service (crash) via a malformed request that specifies a length that is different than the actual length.
How severe is CVE-2001-0545?: CVE-2001-0545 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2001-0545 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 18% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-0545?: CVE-2001-0545 affects Microsoft Internet Information Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-0545?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2001-0545 published?: CVE-2001-0545 was published on 2001-10-30 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:microsoft:internet_information_server:4.0:*:*:*:*:*:*:*

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