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CVE-2026-33063

Estado: AnalizadaAlta (8.7)—

free5GC is an open source 5G core network. free5GC AUSF prior to version 1.4.2 has is an Improper Null Check vulnerability leading to Denial of Service. All deployments of free5GC v4.0.1 using the AUSF UE authentication service (`/nausf-auth/v1/ue-authentications` endpoint) are affected. A remote attacker can cause the AUSF service to panic and crash by sending a crafted UE authentication request that triggers a nil interface conversion in the `GetSupiFromSuciSupiMap` function. This results in complete denial of service for the AUSF authentication service.

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The `GetSupiFromSuciSupiMap` function attempts to perform an interface conversion from `interface{}` to `*context.SuciSupiMap` without checking if the underlying value is nil. When `SuciSupiMap` is nil, the code panics with "interface conversion: interface {} is nil, not *context.SuciSupiMap". free5GC AUSF version 1.4.2 patches the issue. There is no direct workaround at the application level. The recommendation is to apply the provided patch or restrict access to the AUSF API to trusted sources only.

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.

Vector CVSS AV:N/PR:N/UI:N indica explotación remota sin privilegios (T1190). CWE-476 y descripción confirman DoS por crash via endpoint `/nausf-auth/v1/ue-authentications` con request artesanal.

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)

Free5gc — Free5gc

CWE

Referencias

JSON original (NVD)

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      "value": "free5GC is an open source 5G core network. free5GC AUSF prior to version 1.4.2 has is an Improper Null Check vulnerability leading to Denial of Service. All deployments of free5GC v4.0.1 using the AUSF UE authentication service (`/nausf-auth/v1/ue-authentications` endpoint) are affected. A remote attacker can cause the AUSF service to panic and crash by sending a crafted UE authentication request that triggers a nil interface conversion in the `GetSupiFromSuciSupiMap` function. This results in complete denial of service for the AUSF authentication service. The `GetSupiFromSuciSupiMap` function attempts to perform an interface conversion from `interface{}` to `*context.SuciSupiMap` without checking if the underlying value is nil. When `SuciSupiMap` is nil, the code panics with \"interface conversion: interface {} is nil, not *context.SuciSupiMap\". free5GC AUSF version 1.4.2 patches the issue.  There is no direct workaround at the application level. The recommendation is to apply the provided patch or restrict access to the AUSF API to trusted sources only."
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      "value": "free5GC es una red central 5G de código abierto. free5GC AUSF anterior a la versión 1.4.2 tiene una vulnerabilidad de verificación de nulos incorrecta que conduce a la denegación de servicio. Todas las implementaciones de free5GC v4.0.1 que utilizan el servicio de autenticación de UE de AUSF (el endpoint '/nausf-auth/v1/ue-authentications') están afectadas. Un atacante remoto puede causar que el servicio AUSF entre en pánico y falle al enviar una solicitud de autenticación de UE manipulada que activa una conversión de interfaz nula en la función 'GetSupiFromSuciSupiMap'. Esto resulta en una denegación de servicio completa para el servicio de autenticación de AUSF. La función 'GetSupiFromSuciSupiMap' intenta realizar una conversión de interfaz de 'interface{}' a '*context.SuciSupiMap' sin verificar si el valor subyacente es nulo. Cuando 'SuciSupiMap' es nulo, el código entra en pánico con 'interface conversion: interface {} is nil, not *context.SuciSupiMap'. free5GC AUSF versión 1.4.2 parchea el problema. No hay una solución alternativa directa a nivel de aplicación. La recomendación es aplicar el parche proporcionado o restringir el acceso a la API de AUSF solo a fuentes confiables."
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