CVE-1999-0224

Status: ModifiedMedium (5)—💥 Exploit

Denial of service in Windows NT messenger service through a long username.

CVSS

Version: 2.0
Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N
Base score: 5

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 17%
Percentile among all scored CVEs: 97
Score date: 10/7/2026

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).

💥 Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

Published on Exploit-DB · Microsoft Windows NT - Crash with an Extra Long 'Username' Denial of Service (4/1/1997)

Affected technologies (1)

Microsoft — Windows NT

CWEs

NVD-CWE-Other

References

Raw JSON (NVD)

Show

{
  "id": "CVE-1999-0224",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "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": "1999-07-23T04:00:00.000",
  "references": [
    {
      "url": "https://www.cve.org/CVERecord?id=CVE-1999-0224",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://www.cve.org/CVERecord?id=CVE-1999-0224",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Denial of service in Windows NT messenger service through a long username."
    }
  ],
  "lastModified": "2026-06-16T21:47:56.923",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
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              "vulnerable": true,
              "matchCriteriaId": "E53CDA8E-50A8-4509-B070-CCA5604FFB21"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_nt:4.0:sp1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5BDCBCB8-DAA3-465F-ADDE-9143B8251989"
            },
            {
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            },
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              "vulnerable": true,
              "matchCriteriaId": "BB76E7EC-C396-4537-9065-4E815DA7097C"
            },
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              "criteria": "cpe:2.3:o:microsoft:windows_nt:4.0:sp4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4CD026E2-B073-40A6-AD4A-8C76B9169B01"
            },
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              "vulnerable": true,
              "matchCriteriaId": "DBFB3E49-3FB5-4947-856D-727CBFFBA543"
            }
          ],
          "operator": "OR"
        }
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    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}