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CVE-2007-3998

Status: ModifiedMedium (5)—

The wordwrap function in PHP 4 before 4.4.8, and PHP 5 before 5.2.4, does not properly use the breakcharlen variable, which allows remote attackers to cause a denial of service (divide-by-zero error and application crash, or infinite loop) via certain arguments, as demonstrated by a 'chr(0), 0, ""' argument set.

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)

Canonical — Ubuntu LinuxDebian — Debian LinuxPHP — PHP

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2007-3998",
  "cveTags": [],
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        "source": "nvd@nist.gov",
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          "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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  "published": "2007-09-04T18:17:00.000",
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  "vulnStatus": "Modified",
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-20"
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      "lang": "en",
      "value": "The wordwrap function in PHP 4 before 4.4.8, and PHP 5 before 5.2.4, does not properly use the breakcharlen variable, which allows remote attackers to cause a denial of service (divide-by-zero error and application crash, or infinite loop) via certain arguments, as demonstrated by a 'chr(0), 0, \"\"' argument set."
    },
    {
      "lang": "es",
      "value": "La función wordwrap del PHP 4 anterior al 4.4.8 y el PHP 5 anterior al 5.2.4, no utiliza correctamente la variable breakcharlen, lo que permite a atacantes remotos provocar una denegación de servicio (error de división por cero y caída de la aplicación o bucle infinito) a través de ciertos argumentos, como lo demostrado con el establecimiento del argumento 'chr(0), 0, \"\"'."
    }
  ],
  "lastModified": "2026-06-16T22:43:12.670",
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      "comment": "This issue did not affect the versions of PHP as shipped with Red Hat Enterprise Linux 2.1.",
      "lastModified": "2007-09-05T00:00:00",
      "organization": "Red Hat"
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  "sourceIdentifier": "cve@mitre.org"
}