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CVE-2025-48865

Estado: AnalizadaCrítica (9.1)—

Fabio is an HTTP(S) and TCP router for deploying applications managed by consul. Prior to version 1.6.6, Fabio allows clients to remove X-Forwarded headers (except X-Forwarded-For) due to a vulnerability in how it processes hop-by-hop headers. Fabio adds HTTP headers like X-Forwarded-Host and X-Forwarded-Port when routing requests to backend applications. Since the receiving application should trust these headers, allowing HTTP clients to remove or modify them creates potential security vulnerabilities. Some of these custom headers can be removed and, in certain cases, manipulated. The attack relies on the behavior that headers can be defined as hop-by-hop via the HTTP Connection header. This issue has been patched in version 1.6.6.

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.

Inferido por reglas deterministas a partir del vector CVSS y la CWE. Solo orientativo.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningUpdate SoftwarePrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network Traffic

Tecnologías afectadas (1)

Fabiolb — Fabio

CWE

Referencias

JSON original (NVD)

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      "value": "Fabio is an HTTP(S) and TCP router for deploying applications managed by consul. Prior to version 1.6.6, Fabio allows clients to remove X-Forwarded headers (except X-Forwarded-For) due to a vulnerability in how it processes hop-by-hop headers. Fabio adds HTTP headers like X-Forwarded-Host and X-Forwarded-Port when routing requests to backend applications. Since the receiving application should trust these headers, allowing HTTP clients to remove or modify them creates potential security vulnerabilities. Some of these custom headers can be removed and, in certain cases, manipulated. The attack relies on the behavior that headers can be defined as hop-by-hop via the HTTP Connection header. This issue has been patched in version 1.6.6."
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      "lang": "es",
      "value": "Fabio es un enrutador HTTP(S) y TCP para implementar aplicaciones administradas por consul. Antes de la versión 1.6.6, Fabio permitía a los clientes eliminar los encabezados X-Forwarded (excepto X-Forwarded-For) debido a una vulnerabilidad en el procesamiento de los encabezados salto a salto. Fabio añade encabezados HTTP como X-Forwarded-Host y X-Forwarded-Port al enrutar solicitudes a aplicaciones backend. Dado que la aplicación receptora debe confiar en estos encabezados, permitir que los clientes HTTP los eliminen o modifiquen crea posibles vulnerabilidades de seguridad. Algunos de estos encabezados personalizados pueden eliminarse y, en ciertos casos, manipularse. El ataque se basa en que los encabezados pueden definirse como salto a salto mediante el encabezado HTTP Connection. Este problema se ha corregido en la versión 1.6.6."
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  "lastModified": "2026-06-17T09:30:24.323",
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