CVE-2007-1661

Estado: ModificadaMedia (6.4)—
Perl-Compatible Regular Expression (PCRE) library before 7.3 backtracks too far when matching certain input bytes against some regex patterns in non-UTF-8 mode, which allows context-dependent attackers to obtain sensitive information or cause a denial of service (crash), as demonstrated by the "\X?\d" and "\P{L}?\d" patterns.
CVSS

Versión: 2.0
Vector: AV:N/AC:L/Au:N/C:P/I:N/A:P
Puntuación base: 6.4
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 2.49%
Percentil entre todas las CVEs puntuadas: 84
Fecha de la puntuación: 4/10/2026
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 (3)

Apple — MAC OS X Apple — MAC OS X Server Pcre — Perl-compatible Regular Expression Library
CWE

NVD-CWE-Other
Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2007-1661",
  "cveTags": [],
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          "baseScore": 6.4,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
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  "published": "2007-11-07T23:46:00.000",
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      "value": "La librería Perl-Compatible Regular Expression (PCRE) anterior a 7.3 vuelve demasiado atrás cuando compara determinados bytes de entrada con algunos patrones de expresiones regulares en modo no-UTF-8, lo cual permite a atacantes locales o remotos (dependiendo del contexto) obtener información sensible o provocar una denegación de servicio (caída), como se ha demostrado mediante los patrones \"\\X?\\d\" y \"\\P{L}?\\d\"."
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