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CVE-2021-31196

Estado: AnalizadaAlta (7.2)⚠ Explotación activa

Microsoft Exchange Server Remote Code Execution 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).

CISA KEV — explotada activamente

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

CVE-2021-31196 afecta Exchange Server remoto (T1210) con vector AV:N sin requerir interacción (UI:N), permitiendo RCE que ejecuta comandos (T1059.001), comprometiendo cuentas administrativas (T1078.002) y alterando datos (T1565.001). KEV confirma explotación activa.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementDisable or Remove Feature or ProgramVulnerability ScanningUser TrainingUser Account ManagementThreat Intelligence Program

Tecnologías afectadas (1)

Microsoft — Exchange Server

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2021-31196",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2021-31196",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "active"
            },
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              "automatable": "yes"
            },
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              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-01-28T16:51:30.730018Z"
        }
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    "cvssMetricV2": [
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        "source": "nvd@nist.gov",
        "cvssData": {
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          "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P",
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          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
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        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
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        "type": "Secondary",
        "source": "secure@microsoft.com",
        "cvssData": {
          "scope": "UNCHANGED",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
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      },
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              "versionType": "custom"
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          "platforms": [
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  ],
  "published": "2021-07-14T18:15:09.463",
  "references": [
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      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31196",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "secure@microsoft.com"
    },
    {
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31196",
      "tags": [
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      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31196",
      "tags": [
        "US Government Resource"
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Microsoft Exchange Server Remote Code Execution Vulnerability"
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de Ejecución de Código Remota de Microsoft Exchange Server. . Este ID de CVE es diferente de CVE-2021-31206, CVE-2021-34473"
    }
  ],
  "lastModified": "2026-08-10T19:58:38.973",
  "cisaActionDue": "2024-09-11",
  "cisaExploitAdd": "2024-08-21",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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            },
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          "operator": "OR"
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  "sourceIdentifier": "secure@microsoft.com",
  "cisaRequiredAction": "Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.",
  "cisaVulnerabilityName": "Microsoft Exchange Server Information Disclosure Vulnerability"
}