How severe is CVE-2019-0666?

CVE-2019-0666 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-0666 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 20% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-0666?

CVE-2019-0666 primarily affects Microsoft Internet Explorer. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-0666?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-0666 published?

CVE-2019-0666 was published on 2019-04-08 and last updated on 2026-06-17.

CVE-2019-0666

CVE-2019-0666 is a high-severity vulnerability in Microsoft Internet Explorer with a CVSS 3.x base score of 7.5. Its EPSS exploit-prediction score of 20% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.6
EPSS exploit prediction: 20% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Microsoft Internet Explorer
Published: 2019-04-08
Last modified: 2026-06-17

Description

A remote code execution vulnerability exists in the way that the VBScript engine handles objects in memory, aka 'Windows VBScript Engine Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2019-0665, CVE-2019-0667, CVE-2019-0772.

Frequently asked questions

What is CVE-2019-0666?: A remote code execution vulnerability exists in the way that the VBScript engine handles objects in memory, aka 'Windows VBScript Engine Remote Code Execution Vulnerability'. This CVE ID is unique from CVE-2019-0665, CVE-2019-0667, CVE-2019-0772.
How severe is CVE-2019-0666?: CVE-2019-0666 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-0666 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 20% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-0666?: CVE-2019-0666 primarily affects Microsoft Internet Explorer. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-0666?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-0666 published?: CVE-2019-0666 was published on 2019-04-08 and last updated on 2026-06-17.

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0666

Affected products (3)

cpe:2.3:a:microsoft:internet_explorer:9:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:10:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:internet_explorer:11:-:*:*:*:*:*:*

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