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CVE-2014-1559

Status: ModifiedMedium (4.3)—

Mozilla Firefox before 31.0 and Thunderbird before 31.0 allow remote attackers to cause a denial of service (X.509 certificate parsing outage) via a crafted certificate that does not use UTF-8 character encoding in a required context, a different vulnerability than CVE-2014-1558.

CVSS

Exploitation probability (EPSS)

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 (2)

Mozilla — FirefoxMozilla — Thunderbird

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2014-1559",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
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      "source": "security@mozilla.org",
      "affectedData": [
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          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2014-07-23T11:12:43.323",
  "references": [
    {
      "url": "http://secunia.com/advisories/60628",
      "source": "security@mozilla.org"
    },
    {
      "url": "http://www.mozilla.org/security/announce/2014/mfsa2014-65.html",
      "tags": [
        "Vendor Advisory"
      ],
      "source": "security@mozilla.org"
    },
    {
      "url": "http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html",
      "source": "security@mozilla.org"
    },
    {
      "url": "http://www.securitytracker.com/id/1030619",
      "source": "security@mozilla.org"
    },
    {
      "url": "http://www.securitytracker.com/id/1030620",
      "source": "security@mozilla.org"
    },
    {
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1026022",
      "source": "security@mozilla.org"
    },
    {
      "url": "https://security.gentoo.org/glsa/201504-01",
      "source": "security@mozilla.org"
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    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "url": "https://security.gentoo.org/glsa/201504-01",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mozilla Firefox before 31.0 and Thunderbird before 31.0 allow remote attackers to cause a denial of service (X.509 certificate parsing outage) via a crafted certificate that does not use UTF-8 character encoding in a required context, a different vulnerability than CVE-2014-1558."
    },
    {
      "lang": "es",
      "value": "Mozilla Firefox anterior a 31.0 y Thunderbird anterior a 31.0 permiten a atacantes remotos causar una denegación de servicio (interrupción del análisis sintáctico de certificados X.509) a través de un certificado manipulado que no utilice la codificación de caracteres UTF-8 en un contexto requerido, una vulnerabilidad diferente a CVE-2014-1558."
    }
  ],
  "lastModified": "2026-06-17T00:05:09.657",
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  "evaluatorComment": "<a href=\"http://cwe.mitre.org/data/definitions/176.html\" target=\"_blank\">CWE-176: CWE-176: Improper Handling of Unicode Encoding</a>",
  "sourceIdentifier": "security@mozilla.org"
}