How severe is CVE-1999-0766?

CVE-1999-0766 has a CVSS 2.0 base score of 9.3, rated critical severity.

Is CVE-1999-0766 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0766?

CVE-1999-0766 affects Microsoft Java Virtual Machine. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-1999-0766?

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-1999-0766 published?

CVE-1999-0766 was published on 1999-10-21 and last updated on 2026-06-16.

CVE-1999-0766

CVE-1999-0766 is a critical-severity vulnerability in Microsoft Java Virtual Machine with a CVSS 2.0 base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-16.

Key facts

Severity: Critical (CVSS 2.0 base score 9.3)
EPSS exploit prediction: 7% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-16
Affected product: Microsoft Java Virtual Machine
Published: 1999-10-21
Last modified: 2026-06-16

Description

The Microsoft Java Virtual Machine allows a malicious Java applet to execute arbitrary commands outside of the sandbox environment.

Frequently asked questions

What is CVE-1999-0766?: The Microsoft Java Virtual Machine allows a malicious Java applet to execute arbitrary commands outside of the sandbox environment.
How severe is CVE-1999-0766?: CVE-1999-0766 has a CVSS 2.0 base score of 9.3, rated critical severity.
Is CVE-1999-0766 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0766?: CVE-1999-0766 affects Microsoft Java Virtual Machine. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-1999-0766?: 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-1999-0766 published?: CVE-1999-0766 was published on 1999-10-21 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:microsoft:java_virtual_machine:*:*:*:*:*:*:*:*

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