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CVE-2021-38503

Estado: ModificadaCrítica (10)—

The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

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 (4)

Debian — Debian LinuxMozilla — FirefoxMozilla — Firefox ESRMozilla — Thunderbird

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2021-38503",
  "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": "CHANGED",
          "version": "3.1",
          "baseScore": 10,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security@mozilla.org",
      "affectedData": [
        {
          "vendor": "Mozilla",
          "product": "Firefox",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "94",
              "versionType": "custom"
            }
          ]
        },
        {
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          "product": "Thunderbird",
          "versions": [
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              "version": "unspecified",
              "lessThan": "91.3",
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            }
          ]
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        {
          "vendor": "Mozilla",
          "product": "Firefox ESR",
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              "status": "affected",
              "version": "unspecified",
              "lessThan": "91.3",
              "versionType": "custom"
            }
          ]
        }
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    }
  ],
  "published": "2021-12-08T22:15:08.737",
  "references": [
    {
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1729517",
      "tags": [
        "Issue Tracking",
        "Permissions Required",
        "Vendor Advisory"
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      "source": "security@mozilla.org"
    },
    {
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      "tags": [
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      "source": "security@mozilla.org"
    },
    {
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      "tags": [
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      "source": "security@mozilla.org"
    },
    {
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      "source": "security@mozilla.org"
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    {
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      "source": "security@mozilla.org"
    },
    {
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    {
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      "source": "security@mozilla.org"
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    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2021-49/",
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      "source": "security@mozilla.org"
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    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2021-50/",
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      "source": "security@mozilla.org"
    },
    {
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1729517",
      "tags": [
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    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html",
      "tags": [
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    },
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    },
    {
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.debian.org/security/2021/dsa-5026",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.debian.org/security/2022/dsa-5034",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2021-48/",
      "tags": [
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      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2021-49/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.mozilla.org/security/advisories/mfsa2021-50/",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3."
    },
    {
      "lang": "es",
      "value": "Las reglas del sandbox de iframe no se aplicaban correctamente a las hojas de estilo XSLT, permitiendo a un iframe omitir  restricciones como la ejecución de scripts o la navegación por el marco de nivel superior. Esta vulnerabilidad afecta a Firefox versiones anteriores a 94, Thunderbird versiones anteriores a 91.3 y Firefox ESR versiones anteriores a 91.3"
    }
  ],
  "lastModified": "2026-06-17T04:02:14.397",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A22FDA8A-B862-4383-9C8E-C162713AB01B",
              "versionEndExcluding": "94.0"
            },
            {
              "criteria": "cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A4DFF730-C286-4C43-97A0-91926EBE23E2",
              "versionEndExcluding": "91.3"
            },
            {
              "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A63E1C4F-8704-44A6-AAFC-832BA7037977",
              "versionEndExcluding": "91.3"
            }
          ],
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
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          "cpeMatch": [
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              "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252"
            },
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              "vulnerable": true,
              "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73"
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              "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED"
            }
          ],
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  "sourceIdentifier": "security@mozilla.org"
}