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CVE-2021-37151

Estado: ModificadaMedia (5.3)—

CyberArk Identity 21.5.131, when handling an invalid authentication attempt, sometimes reveals whether the username is valid. In certain authentication policy configurations with MFA, the API response length can be used to differentiate between a valid user and an invalid one (aka Username Enumeration). Response differentiation enables attackers to enumerate usernames of valid application users. Attackers can use this information to leverage brute-force and dictionary attacks in order to discover valid account information such as passwords.

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)

Cyberark — Identity

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-37151",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cna@cyber.gov.il",
      "affectedData": [
        {
          "vendor": "CyberArk",
          "product": "Identity",
          "versions": [
            {
              "status": "affected",
              "version": "21.5.131"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-09-01T13:15:08.367",
  "references": [
    {
      "url": "https://www.cyberark.com/products/",
      "source": "cna@cyber.gov.il"
    },
    {
      "url": "https://www.gov.il/en/departments/faq/cve_advisories",
      "source": "cna@cyber.gov.il"
    },
    {
      "url": "https://www.cyberark.com/products/",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.gov.il/en/departments/faq/cve_advisories",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-203"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "CyberArk Identity 21.5.131, when handling an invalid authentication attempt, sometimes reveals whether the username is valid. In certain authentication policy configurations with MFA, the API response length can be used to differentiate between a valid user and an invalid one (aka Username Enumeration). Response differentiation enables attackers to enumerate usernames of valid application users. Attackers can use this information to leverage brute-force and dictionary attacks in order to discover valid account information such as passwords."
    },
    {
      "lang": "es",
      "value": "CyberArk Identity versión 21.5.131, cuando maneja un intento de autenticación no válido, a veces revela si el nombre de usuario es válido. En determinadas configuraciones de políticas de autenticación con MFA, la longitud de la respuesta de la API puede ser usada para diferenciar entre un usuario válido y uno no válido (también se conoce como Enumeración de Nombres de Usuario). La diferenciación de la respuesta permite a atacantes enumerar los nombres de usuario de los usuarios válidos de la aplicación. Los atacantes pueden usar esta información para aprovechar los ataques de fuerza bruta y de diccionario con el fin de detectar información válida de la cuenta, como las contraseñas"
    }
  ],
  "lastModified": "2026-06-17T04:00:09.027",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:cyberark:identity:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BD819936-9C28-43AC-90B8-8447B2B343C2",
              "versionEndExcluding": "21.11.133"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cna@cyber.gov.il"
}