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CVE-2011-0420

Estado: ModificadaMedia (5)—Exploit
Gravedad5Media · CVSS 2.0
Probabilidad de explotación14 %mayor que el 97 % de las CVE
Explotación activaNono figura en el catálogo de CISA
Exploit públicoDisponiblePublicado en Exploit-DB

La función grapheme_extract en la extensión de Internacionalización (Intl) para ICU para PHP v5.3.5 permite provocar una denegación de servicio (con caída de la aplicación) a atacantes dependientes del contexto a través de un argumento de tamaño no válido, lo que provoca una desreferencia de puntero NULL.

CVSS

Puntuación base
5
Versión
2.0
Vector
AV:N/AC:L/Au:N/C:N/I:N/A:P

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días
14 %
Percentil entre todas las CVEs puntuadas
97
Fecha de la puntuación
21/10/2026

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).

Exploits públicos

Hay código de explotación o plantillas de detección públicos. No es lo mismo que explotación activa confirmada (KEV), pero aumenta el riesgo: parchee con prioridad.

Tecnologías afectadas (1)

PHP — PHP

CWE

Referencias

Mostrar las 24 referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2011-0420",
  "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: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
      }
    ]
  },
  "affected": [
    {
      "source": "cret@cert.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2011-02-19T01:00:02.933",
  "references": [
    {
      "url": "http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html",
      "source": "cret@cert.org"
    },
    {
      "url": "http://securityreason.com/achievement_securityalert/94",
      "tags": [
        "Exploit"
      ],
      "source": "cret@cert.org"
    },
    {
      "url": "http://securityreason.com/securityalert/8087",
      "source": "cret@cert.org"
    },
    {
      "url": "http://support.apple.com/kb/HT5002",
      "source": "cret@cert.org"
    },
    {
      "url": "http://svn.php.net/viewvc/php/php-src/trunk/ext/intl/grapheme/grapheme_string.c?r1=306449&r2=306448&pathrev=306449",
      "tags": [
        "Patch"
      ],
      "source": "cret@cert.org"
    },
    {
      "url": "http://www.debian.org/security/2011/dsa-2266",
      "source": "cret@cert.org"
    },
    {
      "url": "http://www.exploit-db.com/exploits/16182",
      "source": "cret@cert.org"
    },
    {
      "url": "http://www.kb.cert.org/vuls/id/210829",
      "tags": [
        "US Government Resource"
      ],
      "source": "cret@cert.org"
    },
    {
      "url": "http://www.securityfocus.com/archive/1/516504/100/0/threaded",
      "source": "cret@cert.org"
    },
    {
      "url": "http://www.securityfocus.com/archive/1/516518/100/0/threaded",
      "source": "cret@cert.org"
    },
    {
      "url": "http://www.securityfocus.com/bid/46429",
      "tags": [
        "Exploit"
      ],
      "source": "cret@cert.org"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/65437",
      "source": "cret@cert.org"
    },
    {
      "url": "http://lists.apple.com/archives/Security-announce/2011//Oct/msg00003.html",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://securityreason.com/achievement_securityalert/94",
      "tags": [
        "Exploit"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://securityreason.com/securityalert/8087",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://support.apple.com/kb/HT5002",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://svn.php.net/viewvc/php/php-src/trunk/ext/intl/grapheme/grapheme_string.c?r1=306449&r2=306448&pathrev=306449",
      "tags": [
        "Patch"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.debian.org/security/2011/dsa-2266",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.exploit-db.com/exploits/16182",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.kb.cert.org/vuls/id/210829",
      "tags": [
        "US Government Resource"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/archive/1/516504/100/0/threaded",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/archive/1/516518/100/0/threaded",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.securityfocus.com/bid/46429",
      "tags": [
        "Exploit"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/65437",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The grapheme_extract function in the Internationalization extension (Intl) for ICU for PHP 5.3.5 allows context-dependent attackers to cause a denial of service (crash) via an invalid size argument, which triggers a NULL pointer dereference."
    },
    {
      "lang": "es",
      "value": "La función grapheme_extract en la extensión de Internacionalización (Intl) para ICU para PHP v5.3.5 permite provocar una denegación de servicio (con caída de la aplicación) a atacantes dependientes del contexto a través de un argumento de tamaño no válido, lo que provoca una desreferencia de puntero NULL."
    }
  ],
  "lastModified": "2026-06-16T23:27:19.550",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:php:php:5.3.5:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A9E6D530-91FC-42F4-A427-6601238E0187"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "evaluatorComment": "Per: http://cwe.mitre.org/data/definitions/476.html\r\n'CWE-476: NULL Pointer Dereference'",
  "sourceIdentifier": "cret@cert.org"
}