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CVE-2016-3227

Status: ModifiedCritical (9.8)—

Use-after-free vulnerability in the DNS Server component in Microsoft Windows Server 2012 Gold and R2 allows remote attackers to execute arbitrary code via crafted requests, aka "Windows DNS Server Use After Free Vulnerability."

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 Server 2012

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2016-3227",
  "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": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.0",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "secure@microsoft.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2016-06-16T01:59:29.967",
  "references": [
    {
      "url": "http://www.securitytracker.com/id/1036095",
      "source": "secure@microsoft.com"
    },
    {
      "url": "https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-071",
      "source": "secure@microsoft.com"
    },
    {
      "url": "http://www.securitytracker.com/id/1036095",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-071",
      "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": "Use-after-free vulnerability in the DNS Server component in Microsoft Windows Server 2012 Gold and R2 allows remote attackers to execute arbitrary code via crafted requests, aka \"Windows DNS Server Use After Free Vulnerability.\""
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de uso después de liberación de memoria en el componente DNS Server en Microsoft Windows Server 2012 Gold y R2 permite a atacantes remotos ejecutar código arbitrario a través de una petición manipulada, también conocida como \"Windows DNS Server Use After Free Vulnerability.\""
    }
  ],
  "lastModified": "2026-06-17T00:45:19.917",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_2012:-:gold:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "AB506484-7F0C-46BF-8EA6-4FB5AF454CED"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:datacenter:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "32BCD530-F6E2-4F9B-AD4C-7DF2BED00296"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:essentials:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A1318333-EF3A-4DBA-8DD7-367BF843F70D"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:standard:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "74B5E7C1-6C1D-4605-91CF-AF105EFA678D"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "evaluatorComment": "<a href=\"http://cwe.mitre.org/data/definitions/416.html\">CWE-416: Use After Free</a>",
  "sourceIdentifier": "secure@microsoft.com"
}