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CVE-2009-4630

Status: ModifiedMedium (5)—

Mozilla Necko, as used in Firefox, SeaMonkey, and other applications, performs DNS prefetching of domain names contained in links within local HTML documents, which makes it easier for remote attackers to determine the network location of the application's user by logging DNS requests. NOTE: the vendor disputes the significance of this issue, stating "I don't think we necessarily need to worry about that case."

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 (3)

Mozilla — FirefoxMozilla — SeamonkeyMozilla — Thunderbird

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2009-4630",
  "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:P/I:N/A:N",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2010-01-29T18:30:00.887",
  "references": [
    {
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=453403",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=492196",
      "source": "cve@mitre.org"
    },
    {
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=453403",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=492196",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-200"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Mozilla Necko, as used in Firefox, SeaMonkey, and other applications, performs DNS prefetching of domain names contained in links within local HTML documents, which makes it easier for remote attackers to determine the network location of the application's user by logging DNS requests.  NOTE: the vendor disputes the significance of this issue, stating \"I don't think we necessarily need to worry about that case.\""
    },
    {
      "lang": "es",
      "value": "Mozilla Necko usado en Firefox, SeaMonkey y otras aplicaciones, realiza una pre-consulta sobre los nombres de dominio en enlaces dentro de los documentos HTML locales, lo que facilita a atacantes remotos el determinar la localización de red de las aplicaciones de usuario mediante peticiones de loggin DNS. NOTA: el fabricante cuestiona la importancia de esta cuestión, diciendo que \"No cree necesario preocuparse por ese tema\"."
    }
  ],
  "lastModified": "2026-06-16T23:14:03.403",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "14E6A30E-7577-4569-9309-53A0AF7FE3AC"
            },
            {
              "criteria": "cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "138701FB-929A-4683-B41F-CB014ACFE44A"
            },
            {
              "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D5C8E657-3049-4462-98F6-296C60BC8C5C"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "vendorComments": [
    {
      "comment": "Not vulnerable. This issue did not affect the versions of Firefox, Thunderbird, or Seamonkey as shipped with Red Hat Enterprise Linux 3, 4,\nor 5.",
      "lastModified": "2010-02-01T00:00:00",
      "organization": "Red Hat"
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}