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CVE-2025-27556

Estado: AnalizadaAlta (7.5)—

An issue was discovered in Django 5.1 before 5.1.8 and 5.0 before 5.0.14. The NFKC normalization is slow on Windows. As a consequence, django.contrib.auth.views.LoginView, django.contrib.auth.views.LogoutView, and django.views.i18n.set_language are subject to a potential denial-of-service attack via certain inputs with a very large number of Unicode characters.

CVSS

Probabilidad de explotación (EPSS)

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad de DoS en vistas autenticadas de Django accesible por red sin autenticación (AV:N, PR:N). Entradas Unicode malformadas sobrecargan normalización NFKC causando indisponibilidad del servicio.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Djangoproject — Django

CWE

Referencias

JSON original (NVD)

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          "version": "2.0.3",
          "timestamp": "2025-04-02T13:21:14.015825Z"
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          "userInteraction": "NONE",
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          "confidentialityImpact": "NONE"
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      "value": "An issue was discovered in Django 5.1 before 5.1.8 and 5.0 before 5.0.14. The NFKC normalization is slow on Windows. As a consequence, django.contrib.auth.views.LoginView, django.contrib.auth.views.LogoutView, and django.views.i18n.set_language are subject to a potential denial-of-service attack via certain inputs with a very large number of Unicode characters."
    },
    {
      "lang": "es",
      "value": "Se descubrió un problema en Django 5.1 antes de 5.1.8 y 5.0 antes de 5.0.14. La normalización de NFKC es lenta en Windows. Como consecuencia, django.contrib.auth.views.loginview, django.contrib.auth.views.logoutview, y django.views.i18n.set_language están sujetos a un posible ataque de denegación de servicio a través de ciertas entradas con un número muy grande de caracteres Unicode."
    }
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  "lastModified": "2026-06-17T09:03:47.890",
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