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CVE-2021-29953

Estado: ModificadaMedia (6.1)—

Una página web maliciosa podría haber forzado a un usuario de Firefox para Android a ejecutar JavaScript controlado por el atacante en el contexto de otro dominio, resultando en una vulnerabilidad de tipo Universal Cross-Site Scripting . *Nota: Este problema sólo afecta a Firefox para Android. Otros sistemas operativos no están afectados. Se están reteniendo temporalmente más detalles para dar a usuarios la oportunidad de actualizarse. Esta vulnerabilidad afecta a Firefox versiones anteriores a 88.0.1 y a Firefox para Android versiones anteriores a 88.1.3

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)

Mozilla — Firefox

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-29953",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@mozilla.org",
      "affectedData": [
        {
          "vendor": "Mozilla",
          "product": "Firefox",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "88.0.1",
              "versionType": "custom"
            }
          ]
        },
        {
          "vendor": "Mozilla",
          "product": "Firefox for Android",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "88.1.3",
              "versionType": "custom"
            }
          ]
        }
      ]
    }
  ],
  "published": "2021-06-24T14:15:10.000",
  "references": [
    {
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1701684",
      "tags": [
        "Permissions Required",
        "Vendor Advisory"
      ],
      "source": "security@mozilla.org"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2021-20/",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "security@mozilla.org"
    },
    {
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1701684",
      "tags": [
        "Permissions Required",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2021-20/",
      "tags": [
        "Release Notes",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A malicious webpage could have forced a Firefox for Android user into executing attacker-controlled JavaScript in the context of another domain, resulting in a Universal Cross-Site Scripting vulnerability. *Note: This issue only affected Firefox for Android. Other operating systems are unaffected. Further details are being temporarily withheld to allow users an opportunity to update.*. This vulnerability affects Firefox < 88.0.1 and Firefox for Android < 88.1.3."
    },
    {
      "lang": "es",
      "value": "Una página web maliciosa podría haber forzado a un usuario de Firefox para Android a ejecutar JavaScript controlado por el atacante en el contexto de otro dominio, resultando en una vulnerabilidad de tipo Universal Cross-Site Scripting . *Nota: Este problema sólo afecta a Firefox para Android. Otros sistemas operativos no están afectados. Se están reteniendo temporalmente más detalles para dar a usuarios la oportunidad de actualizarse. Esta vulnerabilidad afecta a Firefox versiones anteriores a 88.0.1 y a Firefox para Android versiones anteriores a 88.1.3"
    }
  ],
  "lastModified": "2026-06-17T03:48:30.157",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:-:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9DA518B8-6A0A-4AD2-A4C9-6FF6AEA7B56F",
              "versionEndExcluding": "88.0.1"
            },
            {
              "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:android:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1399E175-84F3-424E-8B02-FAF944DA1D84",
              "versionEndExcluding": "88.1.3"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "security@mozilla.org"
}