How severe is CVE-1999-0387?

CVE-1999-0387 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-1999-0387 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-1999-0387?

CVE-1999-0387 primarily affects Microsoft Windows 95. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-0387?

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-1999-0387 published?

CVE-1999-0387 was published on 1999-11-29 and last updated on 2026-06-16.

CVE-1999-0387

CVE-1999-0387 is a high-severity vulnerability in Microsoft Windows 95 with a CVSS 2.0 base score of 7.8. 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-255.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-255
Affected product: Microsoft Windows 95
Published: 1999-11-29
Last modified: 2026-06-16

Description

A legacy credential caching mechanism used in Windows 95 and Windows 98 systems allows attackers to read plaintext network passwords.

Frequently asked questions

What is CVE-1999-0387?: A legacy credential caching mechanism used in Windows 95 and Windows 98 systems allows attackers to read plaintext network passwords.
How severe is CVE-1999-0387?: CVE-1999-0387 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-1999-0387 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0387?: CVE-1999-0387 primarily affects Microsoft Windows 95. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-0387?: 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-1999-0387 published?: CVE-1999-0387 was published on 1999-11-29 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:o:microsoft:windows_95:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_98:*:gold:*:*:*:*:*:*

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