CVE-2012-0021

Estado: ModificadaBaja (2.6)—
The log_cookie function in mod_log_config.c in the mod_log_config module in the Apache HTTP Server 2.2.17 through 2.2.21, when a threaded MPM is used, does not properly handle a %{}C format string, which allows remote attackers to cause a denial of service (daemon crash) via a cookie that lacks both a name and a value.
CVSS

Versión: 2.0
Vector: AV:N/AC:H/Au:N/C:N/I:N/A:P
Puntuación base: 2.6
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 30%
Percentil entre todas las CVEs puntuadas: 98
Fecha de la puntuación: 7/10/2026
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 (1)

Apache — Http Server
CWE

CWE-20
Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2012-0021",
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        "type": "Primary",
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        "cvssData": {
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          "baseScore": 2.6,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:H/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "HIGH",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 4.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
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          "versions": [
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              "version": "n/a"
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  "published": "2012-01-28T04:05:00.750",
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The log_cookie function in mod_log_config.c in the mod_log_config module in the Apache HTTP Server 2.2.17 through 2.2.21, when a threaded MPM is used, does not properly handle a %{}C format string, which allows remote attackers to cause a denial of service (daemon crash) via a cookie that lacks both a name and a value."
    },
    {
      "lang": "es",
      "value": "La función log_cookie en mod_log_config.c en el módulo de mod_log_config en Apache HTTP Server v2.2.17 a v2.2.21, cuando se usa MPM multihilo , no controla correctamente una cadena de formato %{}C , lo que permite a atacantes remotos provocar una denegación de servicio (caída del demonio) a través de una cookie que carece de un nombre y un valor."
    }
  ],
  "lastModified": "2026-06-16T23:36:30.433",
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      "nodes": [
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}