How severe is CVE-2001-1186?

CVE-2001-1186 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2001-1186 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 31% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-1186?

CVE-2001-1186 affects Microsoft Internet Information Services. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-1186?

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

When was CVE-2001-1186 published?

CVE-2001-1186 was published on 2001-12-11 and last updated on 2026-06-16.

CVE-2001-1186

CVE-2001-1186 is a medium-severity vulnerability in Microsoft Internet Information Services with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 31% places it in the 98th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 31% (98th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Internet Information Services
Published: 2001-12-11
Last modified: 2026-06-16

Description

Microsoft IIS 5.0 allows remote attackers to cause a denial of service via an HTTP request with a content-length value that is larger than the size of the request, which prevents IIS from timing out the connection.

Frequently asked questions

What is CVE-2001-1186?: Microsoft IIS 5.0 allows remote attackers to cause a denial of service via an HTTP request with a content-length value that is larger than the size of the request, which prevents IIS from timing out the connection.
How severe is CVE-2001-1186?: CVE-2001-1186 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2001-1186 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 31% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-1186?: CVE-2001-1186 affects Microsoft Internet Information Services. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-1186?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2001-1186 published?: CVE-2001-1186 was published on 2001-12-11 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:microsoft:internet_information_services:5.0:*:*:*:*:*:*:*

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