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CVE-2021-29047

Status: ModifiedHigh (7.5)—

The SimpleCaptcha implementation in Liferay Portal 7.3.4, 7.3.5 and Liferay DXP 7.3 before fix pack 1 does not invalidate CAPTCHA answers after it is used, which allows remote attackers to repeatedly perform actions protected by a CAPTCHA challenge by reusing the same CAPTCHA answer.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (2)

Liferay — DXPLiferay — Liferay Portal

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-29047",
  "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:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "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": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-05-16T16:15:07.297",
  "references": [
    {
      "url": "https://portal.liferay.dev/learn/security/known-vulnerabilities/-/asset_publisher/HbL5mxmVrnXW/content/id/120743467",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://portal.liferay.dev/learn/security/known-vulnerabilities/-/asset_publisher/HbL5mxmVrnXW/content/id/120743467",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The SimpleCaptcha implementation in Liferay Portal 7.3.4, 7.3.5 and Liferay DXP 7.3 before fix pack 1 does not invalidate CAPTCHA answers after it is used, which allows remote attackers to repeatedly perform actions protected by a CAPTCHA challenge by reusing the same CAPTCHA answer."
    },
    {
      "lang": "es",
      "value": "La implementación de SimpleCaptcha en Liferay Portal versiones 7.3.4, 7.3.5 y Liferay DXP versiones 7.3 anteriores al fixpack 1, no invalida las respuestas CAPTCHA después de su uso, lo que permite a atacantes remotos llevar a cabo repetidamente acciones protegidas por un desafío CAPTCHA reutilizando la misma respuesta CAPTCHA"
    }
  ],
  "lastModified": "2026-07-09T01:16:51.907",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:liferay:dxp:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5C0B6536-11D4-48A1-8EC8-FCDFFFD07540",
              "versionEndExcluding": "7.3"
            },
            {
              "criteria": "cpe:2.3:a:liferay:dxp:7.3:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "21C55D41-DB66-494D-BEEB-BDAC7CB4B31B"
            },
            {
              "criteria": "cpe:2.3:a:liferay:liferay_portal:7.3.4:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2C673509-5436-44DF-AFCE-BE5C3188D62F"
            },
            {
              "criteria": "cpe:2.3:a:liferay:liferay_portal:7.3.5:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2B842A08-1EDB-4232-89C9-9B966E251B3B"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}