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CVE-2017-8563

Status: ModifiedHigh (8.1)—

Microsoft Windows 7 SP1, Windows Server 2008 SP2 and R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016 allows an elevation of privilege vulnerability due to Kerberos falling back to NT LAN Manager (NTLM) Authentication Protocol as the default authentication protocol, aka "Windows Elevation of Privilege 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 (7)

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2017-8563",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
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        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 5.1,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:H/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "HIGH",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 4.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
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          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 2.2
      }
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  "affected": [
    {
      "source": "secure@microsoft.com",
      "affectedData": [
        {
          "vendor": "Microsoft Corporation",
          "product": "Microsoft Windows 7 SP1, Windows Server 2008 SP2 and R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016.",
          "versions": [
            {
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              "version": "Microsoft Windows"
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  "published": "2017-07-11T21:29:01.060",
  "references": [
    {
      "url": "http://www.securityfocus.com/bid/99402",
      "tags": [
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        "VDB Entry"
      ],
      "source": "secure@microsoft.com"
    },
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      "url": "https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8563",
      "tags": [
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        "Vendor Advisory"
      ],
      "source": "secure@microsoft.com"
    },
    {
      "url": "http://www.securityfocus.com/bid/99402",
      "tags": [
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        "VDB Entry"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-281"
        }
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Microsoft Windows 7 SP1, Windows Server 2008 SP2 and R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016 allows an elevation of privilege vulnerability due to Kerberos falling back to NT LAN Manager (NTLM) Authentication Protocol as the default authentication protocol, aka \"Windows Elevation of Privilege Vulnerability\"."
    },
    {
      "lang": "es",
      "value": "Microsoft Windows 7 SP1, Windows Server 2008 SP2 y R2 SP1, Windows 8.1 y Windows RT 8.1, Windows Server 2012 y R2, Windows 10 Gold, 1511, 1607, 1703 y Windows Server 2016 permiten una vulnerabilidad de elevación de privilegios debido a que Kerberos  vuelve a tener el protocolo de autenticación NT LAN Manager (NTLM) como el protocolo de autenticación por defecto. Esto también se conoce como \"Windows Elevation of Privilege Vulnerability\"."
    }
  ],
  "lastModified": "2026-06-17T01:26:35.240",
  "configurations": [
    {
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}