CVE-2020-1955

{
  "id": "CVE-2020-1955",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.8,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "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": 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": "n/a",
          "product": "Apache CouchDB",
          "versions": [
            {
              "status": "affected",
              "version": "Apache CouchDB 3.0.0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2020-05-20T14:15:11.550",
  "references": [
    {
      "url": "https://docs.couchdb.org/en/master/cve/2020-1955.html",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "source": "security@apache.org"
    },
    {
      "url": "https://docs.couchdb.org/en/master/cve/2020-1955.html",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-306"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "CouchDB version 3.0.0 shipped with a new configuration setting that governs access control to the entire database server called `require_valid_user_except_for_up`. It was meant as an extension to the long standing setting `require_valid_user`, which in turn requires that any and all requests to CouchDB will have to be made with valid credentials, effectively forbidding any anonymous requests. The new `require_valid_user_except_for_up` is an off-by-default setting that was meant to allow requiring valid credentials for all endpoints except for the `/_up` endpoint. However, the implementation of this made an error that lead to not enforcing credentials on any endpoint, when enabled. CouchDB versions 3.0.1[1] and 3.1.0[2] fix this issue."
    },
    {
      "lang": "es",
      "value": "CouchDB versión 3.0.0, es enviada con una nueva configuración que rige el control de acceso a todo el servidor de base de datos llamada \"require_valid_user_except_for_up\". Se suponía que una extensión del antiguo ajuste \"require_valid_user\", que a su vez requiere que todas y cada una de las peticiones hacia CouchDB tengan que hacerse con credenciales válidas, prohibiendo efectivamente cualquier petición anónima. El nuevo \"require_valid_user_except_for_up\" es un ajuste desactivado por defecto que se supone que permite requerir credenciales válidas para todos los endpoints excepto para el endpoint \"/_up\". Sin embargo, la implementación de éste cometió un error que conllevó a no aplicar las credenciales sobre ningún endpoint, cuando estaba habilitado. CouchDB versiones 3.0.1[1] y 3.1.0[2]  corrige este problema."
    }
  ],
  "lastModified": "2026-06-17T03:02:42.907",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:apache:couchdb:3.0.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6CF039B4-F4AB-4A07-9BE5-5FA7C73A23B4"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@apache.org"
}