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CVE-2023-47124

Estado: ModificadaMedia (5.9)—

Traefik is an open source HTTP reverse proxy and load balancer. When Traefik is configured to use the `HTTPChallenge` to generate and renew the Let's Encrypt TLS certificates, the delay authorized to solve the challenge (50 seconds) can be exploited by attackers to achieve a `slowloris attack`. This vulnerability has been patch in version 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. Users unable to upgrade should replace the `HTTPChallenge` with the `TLSChallenge` or the `DNSChallenge`.

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).

Tecnologías afectadas (1)

Traefik — Traefik

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2023-47124",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.9,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.2
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.9,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 2.2
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "traefik",
          "product": "traefik",
          "versions": [
            {
              "status": "affected",
              "version": "< 2.10.6"
            },
            {
              "status": "affected",
              "version": ">= 3.0.0-beta1, < 3.0.0-beta5"
            }
          ]
        }
      ]
    }
  ],
  "published": "2023-12-04T21:15:33.850",
  "references": [
    {
      "url": "https://doc.traefik.io/traefik/https/acme/#dnschallenge",
      "tags": [
        "Product"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://doc.traefik.io/traefik/https/acme/#httpchallenge",
      "tags": [
        "Product"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://doc.traefik.io/traefik/https/acme/#tlschallenge",
      "tags": [
        "Product"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/traefik/traefik/releases/tag/v2.10.6",
      "tags": [
        "Release Notes"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5",
      "tags": [
        "Release Notes"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://doc.traefik.io/traefik/https/acme/#dnschallenge",
      "tags": [
        "Product"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://doc.traefik.io/traefik/https/acme/#httpchallenge",
      "tags": [
        "Product"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://doc.traefik.io/traefik/https/acme/#tlschallenge",
      "tags": [
        "Product"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/traefik/traefik/releases/tag/v2.10.6",
      "tags": [
        "Release Notes"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5",
      "tags": [
        "Release Notes"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-8g85-whqh-cr2f",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "ttps://www.cloudflare.com/learning/ddos/ddos-attack-tools/slowloris/",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-772"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Traefik is an open source HTTP reverse proxy and load balancer. When Traefik is configured to use the `HTTPChallenge` to generate and renew the Let's Encrypt TLS certificates, the delay authorized to solve the challenge (50 seconds) can be exploited by attackers to achieve a `slowloris attack`. This vulnerability has been patch in version 2.10.6 and 3.0.0-beta5. Users are advised to upgrade. Users unable to upgrade should replace the `HTTPChallenge` with the `TLSChallenge` or the `DNSChallenge`."
    },
    {
      "lang": "es",
      "value": "Traefik es un equilibrador de carga y proxy inverso HTTP de código abierto. Cuando Traefik está configurado para usar `HTTPChallenge` para generar y renovar los certificados TLS de Let's Encrypt, los atacantes pueden aprovechar el retraso autorizado para resolver el desafío (50 segundos) para lograr un `ataque lento`. Esta vulnerabilidad ha sido parcheada en las versiones 2.10.6 y 3.0.0-beta5. Se recomienda a los usuarios que actualicen. Los usuarios que no puedan actualizar deben reemplazar `HTTPChallenge` con `TLSChallenge` o `DNSChallenge`."
    }
  ],
  "lastModified": "2026-06-17T06:32:12.267",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "AB0C6F34-0937-44ED-B248-F7B63DDA7820",
              "versionEndIncluding": "2.10.5"
            },
            {
              "criteria": "cpe:2.3:a:traefik:traefik:3.0.0:beta1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "376EAF9B-E994-4268-9704-0A45EA30270F"
            },
            {
              "criteria": "cpe:2.3:a:traefik:traefik:3.0.0:beta2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F3D08335-C291-4623-B80C-3B14C4D1FA32"
            },
            {
              "criteria": "cpe:2.3:a:traefik:traefik:3.0.0:beta3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "21033CEE-CEF5-4B0D-A565-4A6FC764AA6D"
            },
            {
              "criteria": "cpe:2.3:a:traefik:traefik:3.0.0:beta4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "4B5B7BC8-0BBF-48DC-86B1-FC3D7CB8D5AD"
            }
          ],
          "operator": "OR"
        }
      ]
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  ],
  "sourceIdentifier": "security-advisories@github.com"
}