CVE-1999-0995

CVE-1999-0995 is a high-severity vulnerability in Microsoft Windows Nt with a CVSS 2.0 base score of 7.8. Its EPSS exploit-prediction score of 22% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-20.

Key facts

Description

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."

Frequently asked questions

What is CVE-1999-0995?
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."
How severe is CVE-1999-0995?
CVE-1999-0995 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-1999-0995 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 22% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-1999-0995?
CVE-1999-0995 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-1999-0995?
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-1999-0995 published?
CVE-1999-0995 was published on 1999-12-16 and last updated on 2026-06-16.

References

Affected products (4)

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