« Back to list

CVE-1999-0995

Status: ModifiedHigh (7.8)—

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."

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

Microsoft — Windows NT

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-1999-0995",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 7.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 6.9,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "1999-12-16T05:00:00.000",
  "references": [
    {
      "url": "http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ248185",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://www.securityfocus.com/bid/875",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-057",
      "source": "cve@mitre.org"
    },
    {
      "url": "http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ248185",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/875",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://docs.microsoft.com/en-us/security-updates/securitybulletins/1999/ms99-057",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "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.\""
    }
  ],
  "lastModified": "2026-06-16T21:49:29.080",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:microsoft:windows_nt:4.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E53CDA8E-50A8-4509-B070-CCA5604FFB21"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_nt:4.0:*:server:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7C5FCE82-1E2F-49B9-B504-8C03F2BCF296"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_nt:4.0:*:terminal_server:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6E7E6AD3-5418-4FEA-84B5-833059CA880D"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_nt:4.0:sp1:enterprise:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BBD9C514-5AF7-4849-A535-F0F3C9339051"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}