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CVE-2021-31805

Estado: ModificadaCrítica (9.8)—

The fix issued for CVE-2020-17530 was incomplete. So from Apache Struts 2.0.0 to 2.5.29, still some of the tag’s attributes could perform a double evaluation if a developer applied forced OGNL evaluation by using the %{...} syntax. Using forced OGNL evaluation on untrusted user input can lead to a Remote Code Execution and security degradation.

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 (1)

Apache — Struts

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-31805",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 7.5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/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": "security@apache.org",
      "affectedData": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache Struts",
          "versions": [
            {
              "status": "affected",
              "version": "2.0.0 to 2.5.29"
            }
          ]
        }
      ]
    }
  ],
  "published": "2022-04-12T16:15:08.133",
  "references": [
    {
      "url": "http://www.openwall.com/lists/oss-security/2022/04/12/6",
      "tags": [
        "Mailing List",
        "Mitigation",
        "Third Party Advisory"
      ],
      "source": "security@apache.org"
    },
    {
      "url": "https://cwiki.apache.org/confluence/display/WW/S2-062",
      "tags": [
        "Mitigation",
        "Patch",
        "Vendor Advisory"
      ],
      "source": "security@apache.org"
    },
    {
      "url": "https://security.netapp.com/advisory/ntap-20220420-0001/",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "security@apache.org"
    },
    {
      "url": "https://www.oracle.com/security-alerts/cpujul2022.html",
      "source": "security@apache.org"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2022/04/12/6",
      "tags": [
        "Mailing List",
        "Mitigation",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://cwiki.apache.org/confluence/display/WW/S2-062",
      "tags": [
        "Mitigation",
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://security.netapp.com/advisory/ntap-20220420-0001/",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.oracle.com/security-alerts/cpujul2022.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@apache.org",
      "description": [
        {
          "lang": "en",
          "value": "CWE-917"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-917"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The fix issued for CVE-2020-17530 was incomplete. So from Apache Struts 2.0.0 to 2.5.29, still some of the tag’s attributes could perform a double evaluation if a developer applied forced OGNL evaluation by using the %{...} syntax. Using forced OGNL evaluation on untrusted user input can lead to a Remote Code Execution and security degradation."
    },
    {
      "lang": "es",
      "value": "La corrección emitida para CVE-2020-17530 era incompleta. Así, desde Apache Struts versiones 2.0.0 hasta 2.5.29, todavía algunos de los atributos de las etiquetas podían llevar a cabo una doble evaluación si un desarrollador aplicaba la evaluación OGNL forzada usando la sintaxis %{...}. El uso de la evaluación forzada de OGNL en entradas de usuario no confiables puede conllevar a una Ejecución de Código Remota y una degradación de la seguridad"
    }
  ],
  "lastModified": "2026-06-17T03:52:15.950",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "24A8DF7C-82D9-4D56-AAE7-5D1DEB1CD558",
              "versionEndIncluding": "2.5.29",
              "versionStartIncluding": "2.0.0"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@apache.org"
}