CVE-1999-0874

CVE-1999-0874 is a critical-severity vulnerability in Microsoft Internet Information Server with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 75% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Description

Buffer overflow in IIS 4.0 allows remote attackers to cause a denial of service via a malformed request for files with .HTR, .IDC, or .STM extensions.

Frequently asked questions

What is CVE-1999-0874?
Buffer overflow in IIS 4.0 allows remote attackers to cause a denial of service via a malformed request for files with .HTR, .IDC, or .STM extensions.
How severe is CVE-1999-0874?
CVE-1999-0874 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-1999-0874 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 75% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0874?
CVE-1999-0874 primarily affects Microsoft Internet Information Server. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-0874?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-1999-0874 published?
CVE-1999-0874 was published on 1999-06-16 and last updated on 2026-06-16.

References

Affected products (4)

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