CVE-2006-3440

Status: ModifiedHigh (10)—💥 Exploit

Buffer overflow in the Winsock API in Microsoft Windows 2000 SP4, XP SP1 and SP2, and Server 2003 SP1 allows remote attackers to execute arbitrary code via unknown vectors, aka "Winsock Hostname Vulnerability."

CVSS

Version: 2.0
Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C
Base score: 10

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 57%
Percentile among all scored CVEs: 99
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 - DNS Resolution Remote Denial of Service (PoC) (MS06-041) (12/9/2006)

Affected technologies (3)

Microsoft — Windows 2000 Microsoft — Windows 2003 Server Microsoft — Windows XP

CWEs

NVD-CWE-Other

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2006-3440",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 10,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
        },
        "acInsufInfo": false,
        "impactScore": 10,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": true,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
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      "source": "secure@microsoft.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
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  ],
  "published": "2006-08-09T01:04:00.000",
  "references": [
    {
      "url": "http://secunia.com/advisories/21394",
      "source": "secure@microsoft.com"
    },
    {
      "url": "http://securitytracker.com/id?1016653",
      "source": "secure@microsoft.com"
    },
    {
      "url": "http://www.kb.cert.org/vuls/id/908276",
      "tags": [
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        "US Government Resource"
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      "source": "secure@microsoft.com"
    },
    {
      "url": "http://www.securityfocus.com/bid/19319",
      "source": "secure@microsoft.com"
    },
    {
      "url": "http://www.us-cert.gov/cas/techalerts/TA06-220A.html",
      "tags": [
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      "source": "secure@microsoft.com"
    },
    {
      "url": "http://www.vupen.com/english/advisories/2006/3211",
      "source": "secure@microsoft.com"
    },
    {
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      "source": "secure@microsoft.com"
    },
    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A747",
      "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": "Buffer overflow in the Winsock API in Microsoft Windows 2000 SP4, XP SP1 and SP2, and Server 2003 SP1 allows remote attackers to execute arbitrary code via unknown vectors, aka \"Winsock Hostname Vulnerability.\""
    },
    {
      "lang": "es",
      "value": "Desbordamiento de búfer en Winsock API en Microsoft Windows 2000 SP4, XP SP1 y SP2, y Server 2003 SP1 permite a atacantes remotos ejecutar código de su elección a tavés de vectores desconocidos, tambien conocido cómo \"Vulnerabilidad Winsock Hostname\"."
    }
  ],
  "lastModified": "2026-06-16T22:27:03.930",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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            },
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            },
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            },
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            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "91D6D065-A28D-49DA-B7F4-38421FF86498"
            },
            {
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              "matchCriteriaId": "B9687E6C-EDE9-42E4-93D0-C4144FEC917A"
            },
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              "vulnerable": true,
              "matchCriteriaId": "FB2BE2DE-7B06-47ED-A674-15D45448F357"
            }
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          "operator": "OR"
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  ],
  "sourceIdentifier": "secure@microsoft.com"
}