CVE-2009-3720

Estado: ModificadaMedia (5)—
The updatePosition function in lib/xmltok_impl.c in libexpat in Expat 2.0.1, as used in Python, PyXML, w3c-libwww, and other software, allows context-dependent attackers to cause a denial of service (application crash) via an XML document with crafted UTF-8 sequences that trigger a buffer over-read, a different vulnerability than CVE-2009-2625.
CVSS

Versión: 2.0
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Puntuación base: 5
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 28%
Percentil entre todas las CVEs puntuadas: 98
Fecha de la puntuación: 6/10/2026
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 (2)

Apache — Http Server Libexpat Project — Libexpat
CWE

NVD-CWE-noinfo
Referencias

JSON original (NVD)

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{
  "id": "CVE-2009-3720",
  "cveTags": [],
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        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
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  },
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          "versions": [
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              "version": "n/a"
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  "published": "2009-11-03T16:30:12.563",
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      "source": "nvd@nist.gov",
      "description": [
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          "value": "NVD-CWE-noinfo"
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      "lang": "en",
      "value": "The updatePosition function in lib/xmltok_impl.c in libexpat in Expat 2.0.1, as used in Python, PyXML, w3c-libwww, and other software, allows context-dependent attackers to cause a denial of service (application crash) via an XML document with crafted UTF-8 sequences that trigger a buffer over-read, a different vulnerability than CVE-2009-2625."
    },
    {
      "lang": "es",
      "value": "La función updatePosition en lib/xmltok_impl.c en libexpat en Expat v2.0.1, usado en  Python, PyXML, w3c-libwww, ay otros programas, permite a atacantes dependientes de contexto, provocar una denegación de servicio (caída de aplicación) a través de un documento XML con una secuencia de caracteres UTF-8 manipulada que provoca un desbordamiento de búfer fuera de límite (over-read). Vulnerabilidad distinta de CVE-2009-2625."
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  "lastModified": "2026-07-20T14:35:41.700",
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      "comment": "Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-3720\n\nThe Red Hat Security Response Team has rated this issue as having moderate security impact in Python, a future update may address this flaw. If a system has PyXML installed, Python will use PyXML for expat-related functions and is then not vulnerable to the issue.",
      "lastModified": "2010-03-05T00:00:00",
      "organization": "Red Hat"
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  "sourceIdentifier": "secalert@redhat.com"
}