How severe is CVE-1999-0994?

CVE-1999-0994 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-1999-0994 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-1999-0994?

CVE-1999-0994 primarily affects Microsoft Windows Nt. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-1999-0994?

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

When was CVE-1999-0994 published?

CVE-1999-0994 was published on 1999-12-16 and last updated on 2026-06-16.

CVE-1999-0994

CVE-1999-0994 is a medium-severity vulnerability in Microsoft Windows Nt with a CVSS 2.0 base score of 5.0. 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: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 7% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-255
Affected product: Microsoft Windows Nt
Published: 1999-12-16
Last modified: 2026-06-16

Description

Windows NT with SYSKEY reuses the keystream that is used for encrypting SAM password hashes, allowing an attacker to crack passwords.

Frequently asked questions

What is CVE-1999-0994?: Windows NT with SYSKEY reuses the keystream that is used for encrypting SAM password hashes, allowing an attacker to crack passwords.
How severe is CVE-1999-0994?: CVE-1999-0994 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-1999-0994 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-1999-0994?: CVE-1999-0994 primarily affects Microsoft Windows Nt. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-1999-0994?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-1999-0994 published?: CVE-1999-0994 was published on 1999-12-16 and last updated on 2026-06-16.

References

Affected products (4)

cpe:2.3:o:microsoft:windows_nt:4.0:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:*:server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:*:terminal_server:*:*:*:*:*
cpe:2.3:o:microsoft:windows_nt:4.0:sp1:enterprise:*:*:*:*:*

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