How severe is CVE-1999-1128?

CVE-1999-1128 has a CVSS 2.0 base score of 5.1, rated medium severity.

Is CVE-1999-1128 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-1128?

CVE-1999-1128 affects Microsoft Internet Explorer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-1999-1128?

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

When was CVE-1999-1128 published?

CVE-1999-1128 was published on 1997-03-01 and last updated on 2026-06-16.

CVE-1999-1128

CVE-1999-1128 is a medium-severity vulnerability in Microsoft Internet Explorer with a CVSS 2.0 base score of 5.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.1)
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Internet Explorer
Published: 1997-03-01
Last modified: 2026-06-16

Description

Internet Explorer 3.01 on Windows 95 allows remote malicious web sites to execute arbitrary commands via a .isp file, which is automatically downloaded and executed without prompting the user.

Frequently asked questions

What is CVE-1999-1128?: Internet Explorer 3.01 on Windows 95 allows remote malicious web sites to execute arbitrary commands via a .isp file, which is automatically downloaded and executed without prompting the user.
How severe is CVE-1999-1128?: CVE-1999-1128 has a CVSS 2.0 base score of 5.1, rated medium severity.
Is CVE-1999-1128 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-1128?: CVE-1999-1128 affects Microsoft Internet Explorer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-1999-1128?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-1128 published?: CVE-1999-1128 was published on 1997-03-01 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:microsoft:internet_explorer:3.0.1:*:*:*:*:*:*:*

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