CVE-1999-0995: n/a vulnerability

CVE-1999-0995: Windows NT Local Security Authority (LSA) allows remote attackers to cause a denial of service via malforme...

Windows NT Local Security Authority (LSA) allows remote attackers to cause a denial of service via malformed arguments to the LsaLookupSids function which looks up the SID, aka "Malformed Security Identifier Request."

UnknownCVSS not scoredNot KEV-listedUpdatedAug 1, 2024, 16:55 UTC (UTC+00:00)

Security readout for executives and security teams

A flaw in Windows NT's Local Security Authority let a remote attacker send a malformed security identifier lookup that crashed the service. The result was a denial of service on the affected server, disrupting authentication and related security functions until the system was restarted or patched. Microsoft published a fix in 1999 under bulletin MS99-057. Exposure is limited to legacy Windows NT systems still exposing LSA/RPC endpoints on reachable networks. Modern, supported Windows versions are not identified as affected in the cited sources, so most current enterprise fleets should have negligible exposure. Low priority for modern environments. Only relevant if legacy Windows NT systems remain in production, in which case retire or patch them promptly given no vendor support and broader unpatched risk. Mitigation focus: Apply Microsoft Security Bulletin MS99-057 / KB Q248185 on any remaining Windows NT hosts.; Retire or isolate unsupported Windows NT systems from routable networks.; Restrict LSA/RPC access to trusted management segments via firewall rules..

Prepared: Jul 12, 2026, 06:26 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jan 18, 2000, 05:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

2Source links

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
MS99-057CVE reference · vendor-advisory, x_refsource_MS

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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