How severe is CVE-1999-0668?

CVE-1999-0668 has a CVSS 2.0 base score of 5.1, rated medium severity.

Is CVE-1999-0668 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 23% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0668?

CVE-1999-0668 primarily affects Microsoft Internet Explorer. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-0668?

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

When was CVE-1999-0668 published?

CVE-1999-0668 was published on 1999-08-21 and last updated on 2026-06-16.

CVE-1999-0668

CVE-1999-0668 is a medium-severity vulnerability in Microsoft Internet Explorer with a CVSS 2.0 base score of 5.1. Its EPSS exploit-prediction score of 23% places it in the 97th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Medium (CVSS 2.0 base score 5.1)
EPSS exploit prediction: 23% (97th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Microsoft Internet Explorer
Published: 1999-08-21
Last modified: 2026-06-16

Description

The scriptlet.typelib ActiveX control is marked as "safe for scripting" for Internet Explorer, which allows a remote attacker to execute arbitrary commands as demonstrated by Bubbleboy.

Frequently asked questions

What is CVE-1999-0668?: The scriptlet.typelib ActiveX control is marked as "safe for scripting" for Internet Explorer, which allows a remote attacker to execute arbitrary commands as demonstrated by Bubbleboy.
How severe is CVE-1999-0668?: CVE-1999-0668 has a CVSS 2.0 base score of 5.1, rated medium severity.
Is CVE-1999-0668 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 23% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0668?: CVE-1999-0668 primarily affects Microsoft Internet Explorer. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-0668?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-0668 published?: CVE-1999-0668 was published on 1999-08-21 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:microsoft:internet_explorer:4.0:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:5.0:*:*:*:*:*:*:*

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