Security readout for executives and security teams
A very old flaw in Windows NT's SYSKEY feature reused the same encryption keystream to protect the SAM password database. Because the keystream repeated, an attacker with access to the password file could unscramble and crack user passwords more easily than intended. Microsoft addressed it in bulletin MS99-056 in 1999. Limited to legacy Windows NT systems with SYSKEY enabled. Modern Windows versions are not in scope. Exposure today is confined to unretired NT hosts still running in isolated OT, lab, or archival environments, which should already be considered end-of-life risk. Low priority for modern estates; treat as a legacy hygiene item. If any Windows NT system still exists, elevate to high priority for decommissioning, since the underlying platform carries far broader unpatched risk than this single issue. Mitigation focus: Apply Microsoft bulletin MS99-056 / KB Q248183 on any remaining Windows NT systems.; Retire or isolate any surviving Windows NT hosts from production networks.; Restrict physical and administrative access to systems holding SAM files..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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Credential and access behavior lookup
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Open ATT&CK lookupCVE-1999-0994 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
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CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- MS99-056CVE reference · vendor-advisory, x_refsource_MS
Products and packages named in the record
CWE details
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