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CVE-2019-1166

Status: ModifiedMedium (5.9)—

A tampering vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLM MIC (Message Integrity Check) protection, aka 'Windows NTLM Tampering 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 (8)

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2019-1166",
  "cveTags": [],
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          "confidentialityImpact": "NONE"
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            },
            {
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              "version": "2008 for 32-bit Systems Service Pack 2 (Core installation)"
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            {
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              "version": "2012"
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            {
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              "version": "2012 (Core installation)"
            },
            {
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              "version": "2012 R2"
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              "version": "2012 R2 (Core installation)"
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              "version": "2016"
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              "version": "2016  (Core installation)"
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  "published": "2019-10-10T14:15:15.080",
  "references": [
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      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1166",
      "tags": [
        "Patch",
        "Vendor Advisory"
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      "source": "secure@microsoft.com"
    },
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      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1166",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
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      "source": "nvd@nist.gov",
      "description": [
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          "value": "CWE-354"
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      "lang": "en",
      "value": "A tampering vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLM MIC (Message Integrity Check) protection, aka 'Windows NTLM Tampering Vulnerability'."
    },
    {
      "lang": "es",
      "value": "Hay una vulnerabilidad de manipulación en Microsoft Windows cuando un atacante de tipo man-in-the-middle es capaz de omitir con éxito la protección NTLM MIC (Comprobación de Integridad de Mensajes), también se conoce como \"Windows NTLM Tampering Vulnerability\"."
    }
  ],
  "lastModified": "2026-06-17T02:27:59.150",
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}