How severe is CVE-1999-0233?

CVE-1999-0233 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-1999-0233 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 16% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0233?

CVE-1999-0233 affects Microsoft Internet Information Services. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-1999-0233?

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-1999-0233 published?

CVE-1999-0233 was published on 1996-02-25 and last updated on 2026-06-16.

CVE-1999-0233

CVE-1999-0233 is a critical-severity vulnerability in Microsoft Internet Information Services with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 16% places it in the 97th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 16% (97th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Internet Information Services
Published: 1996-02-25
Last modified: 2026-06-16

Description

IIS 1.0 allows users to execute arbitrary commands using .bat or .cmd files.

Frequently asked questions

What is CVE-1999-0233?: IIS 1.0 allows users to execute arbitrary commands using .bat or .cmd files.
How severe is CVE-1999-0233?: CVE-1999-0233 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-1999-0233 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 16% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0233?: CVE-1999-0233 affects Microsoft Internet Information Services. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-1999-0233?: 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-1999-0233 published?: CVE-1999-0233 was published on 1996-02-25 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:microsoft:internet_information_services:1.0:*:*:*:*:*:*:*

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