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CVE-2019-1338

Estado: ModificadaMedia (5.9)—

Se presenta una vulnerabilidad de omisión de característica de seguridad en Microsoft Windows cuando un atacante de tipo man-in-the-middle es capaz de omitir con éxito la protección NTLMv2 si un cliente también envía respuestas LMv2, también se conoce como "Windows NTLM Security Feature Bypass Vulnerability".

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2019-1338",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.9,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.2
      }
    ]
  },
  "affected": [
    {
      "source": "secure@microsoft.com",
      "affectedData": [
        {
          "vendor": "Microsoft",
          "product": "Windows",
          "versions": [
            {
              "status": "affected",
              "version": "7 for 32-bit Systems Service Pack 1"
            },
            {
              "status": "affected",
              "version": "7 for x64-based Systems Service Pack 1"
            }
          ]
        },
        {
          "vendor": "Microsoft",
          "product": "Windows Server",
          "versions": [
            {
              "status": "affected",
              "version": "2008 R2 for x64-based Systems Service Pack 1 (Core installation)"
            },
            {
              "status": "affected",
              "version": "2008 R2 for Itanium-Based Systems Service Pack 1"
            },
            {
              "status": "affected",
              "version": "2008 R2 for x64-based Systems Service Pack 1"
            },
            {
              "status": "affected",
              "version": "2008 for 32-bit Systems Service Pack 2 (Core installation)"
            },
            {
              "status": "affected",
              "version": "2008 for Itanium-Based Systems Service Pack 2"
            },
            {
              "status": "affected",
              "version": "2008 for 32-bit Systems Service Pack 2"
            },
            {
              "status": "affected",
              "version": "2008 for x64-based Systems Service Pack 2"
            },
            {
              "status": "affected",
              "version": "2008 for x64-based Systems Service Pack 2 (Core installation)"
            }
          ]
        }
      ]
    }
  ],
  "published": "2019-10-10T14:15:17.097",
  "references": [
    {
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1338",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "secure@microsoft.com"
    },
    {
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1338",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A security feature bypass vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLMv2 protection if a client is also sending LMv2 responses, aka 'Windows NTLM Security Feature Bypass Vulnerability'."
    },
    {
      "lang": "es",
      "value": "Se presenta una vulnerabilidad de omisión de característica de seguridad en Microsoft Windows cuando un atacante de tipo  man-in-the-middle es capaz de omitir con éxito la protección NTLMv2 si un cliente también envía respuestas LMv2, también se conoce como \"Windows NTLM Security Feature Bypass Vulnerability\"."
    }
  ],
  "lastModified": "2026-06-17T02:28:24.680",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C2B1C231-DE19-4B8F-A4AA-5B3A65276E46"
            },
            {
              "criteria": "cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5F422A8C-2C4E-42C8-B420-E0728037E15C"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "B320A104-9037-487E-BC9A-62B4A6B49FD0"
            },
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              "criteria": "cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*",
              "vulnerable": true,
              "matchCriteriaId": "AF07A81D-12E5-4B1D-BFF9-C8D08C32FF4F"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "secure@microsoft.com"
}