CVE-2015-4509

Status: ModifiedHigh (7.5)—
Use-after-free vulnerability in the HTMLVideoElement interface in Mozilla Firefox before 41.0 and Firefox ESR 38.x before 38.3 allows remote attackers to execute arbitrary code via crafted JavaScript code that modifies the URI table of a media element, aka ZDI-CAN-3176.
CVSS

Version: 2.0
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Base score: 7.5
Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 6.08%
Percentile among all scored CVEs: 93
Score date: 10/11/2026
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 (1)

Mozilla — Firefox
CWEs

NVD-CWE-Other
References

Raw JSON (NVD)

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{
  "id": "CVE-2015-4509",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "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,
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  "published": "2015-09-24T04:59:12.270",
  "references": [
    {
      "url": "http://lists.opensuse.org/opensuse-security-announce/2015-10/msg00000.html",
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  "vulnStatus": "Modified",
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      "lang": "en",
      "value": "Use-after-free vulnerability in the HTMLVideoElement interface in Mozilla Firefox before 41.0 and Firefox ESR 38.x before 38.3 allows remote attackers to execute arbitrary code via crafted JavaScript code that modifies the URI table of a media element, aka ZDI-CAN-3176."
    },
    {
      "lang": "es",
      "value": "Vulnerabilidad de uso después de liberación en la memoria en la interfaz HTMLVideoElement en Mozilla Firefox en versiones anteriores a 41.0 y Firefox ESR 38.x en versiones anteriores a 38.3, permite a atacantes remotos ejecutar código arbitrario a través de código JavaScript que modifica la tabla URI de un elemento media, también conocida como ZDI-CAN-3176."
    }
  ],
  "lastModified": "2026-06-17T00:27:26.163",
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  "evaluatorComment": "<a href=\"http://cwe.mitre.org/data/definitions/416.html\">CWE-416: Use After Free</a>",
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}