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CVE-2025-43859

Estado: AplazadaCrítica (9.1)—

h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11's parsing of line terminators in chunked-coding message bodies can lead to request smuggling vulnerabilities under certain conditions. This issue has been patched in version 0.16.0. Since exploitation requires the combination of buggy h11 with a buggy (reverse) proxy, fixing either component is sufficient to mitigate this issue.

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 ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkFilter Network TrafficApplication Isolation and Sandboxing

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

H11 — H11AI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2025-43859",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-43859",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-04-24T19:02:05.000674Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.1,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "python-hyper",
          "product": "h11",
          "versions": [
            {
              "status": "affected",
              "version": "< 0.16.0"
            }
          ]
        }
      ]
    }
  ],
  "published": "2025-04-24T19:15:47.060",
  "references": [
    {
      "url": "https://github.com/python-hyper/h11/commit/114803a29ce50116dc47951c690ad4892b1a36ed",
      "source": "security-advisories@github.com"
    },
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      "url": "https://github.com/python-hyper/h11/security/advisories/GHSA-vqfr-h8mv-ghfj",
      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
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      "description": [
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      "lang": "en",
      "value": "h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11's parsing of line terminators in chunked-coding message bodies can lead to request smuggling vulnerabilities under certain conditions. This issue has been patched in version 0.16.0. Since exploitation requires the combination of buggy h11 with a buggy (reverse) proxy, fixing either component is sufficient to mitigate this issue."
    },
    {
      "lang": "es",
      "value": "h11 es una implementación de Python de HTTP/1.1. Antes de la versión 0.16.0, una tolerancia en el análisis de terminadores de línea por parte de h11 en cuerpos de mensajes con codificación fragmentada podía provocar vulnerabilidades de contrabando de solicitudes en ciertas circunstancias. Este problema se ha corregido en la versión 0.16.0. Dado que su explotación requiere la combinación de h11 con errores y un proxy inverso con errores, la corrección de cualquiera de los componentes es suficiente para mitigar este problema."
    }
  ],
  "lastModified": "2026-06-17T09:24:39.580",
  "sourceIdentifier": "security-advisories@github.com"
}