CVE-1999-0994

NONECVSS 0.0Elevated

0.0

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

CVSS v3: —
EG Score: —
EPSS: 95.5%
KEV: Not listed

Published

December 16, 1999

Last Modified

April 16, 2026

References (6)

cve@mitrehttp://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ248183
cve@mitrehttp://www.securityfocus.com/bid/873
cve@mitrehttps://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-056
af854a3a-2127-422b-91ae-364da2661108http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ248183
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/873
af854a3a-2127-422b-91ae-364da2661108https://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-056

Data Freshness Timeline

(refreshed 11× in last 7d / 17× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-29 13:40 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
2026-05-28 13:42 UTCepss_batch
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2026-05-24 16:42 UTCepss_batch
2026-05-22 21:15 UTCepss_batch
2026-05-20 22:36 UTCepss_batch
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2026-05-18 21:29 UTCepss_batch
2026-05-18 21:29 UTCepss_batch

Frequently asked(4)

What is CVE-1999-0994?

CVE-1999-0994 is a none vulnerability published on December 16, 1999. Windows NT with SYSKEY reuses the keystream that is used for encrypting SAM password hashes, allowing an attacker to crack passwords.

When was CVE-1999-0994 disclosed?

CVE-1999-0994 was first published in the National Vulnerability Database on December 16, 1999, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-1999-0994 actively exploited?

CVE-1999-0994 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-1999-0994?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-0994, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-1999-0994

📅 Published

🔄 Last Modified

🔗 References (6)