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CVE-2021-3909

Estado: ModificadaAlta (7.5)—

OctoRPKI does not limit the length of a connection, allowing for a slowloris DOS attack to take place which makes OctoRPKI wait forever. Specifically, the repository that OctoRPKI sends HTTP requests to will keep the connection open for a day before a response is returned, but does keep drip feeding new bytes to keep the connection alive.

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 (2)

Cloudflare — OctorpkiDebian — Debian Linux

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2021-3909",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "cna@cloudflare.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 4.4,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 0.7
      },
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        "source": "nvd@nist.gov",
        "cvssData": {
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          "userInteraction": "NONE",
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  "affected": [
    {
      "source": "cna@cloudflare.com",
      "affectedData": [
        {
          "vendor": "Cloudflare",
          "product": "octorpki",
          "versions": [
            {
              "status": "affected",
              "version": "unspecified",
              "lessThan": "1.4.0",
              "versionType": "custom"
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    }
  ],
  "published": "2021-11-11T22:15:07.923",
  "references": [
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      "url": "https://github.com/cloudflare/cfrpki/security/advisories/GHSA-8cvr-4rrf-f244",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "cna@cloudflare.com"
    },
    {
      "url": "https://www.debian.org/security/2021/dsa-5033",
      "tags": [
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      "source": "cna@cloudflare.com"
    },
    {
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      "tags": [
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      "source": "cna@cloudflare.com"
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      "tags": [
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      "tags": [
        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "cna@cloudflare.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "OctoRPKI does not limit the length of a connection, allowing for a slowloris DOS attack to take place which makes OctoRPKI wait forever. Specifically, the repository that OctoRPKI sends HTTP requests to will keep the connection open for a day before a response is returned, but does keep drip feeding new bytes to keep the connection alive."
    },
    {
      "lang": "es",
      "value": "OctoRPKI no limita la duración de una conexión, permitiendo que se produzca un ataque slowloris DOS que hace que OctoRPKI espere eternamente. En concreto, el repositorio al que OctoRPKI envía peticiones HTTP mantendrá la conexión abierta durante un día antes de que se devuelva una respuesta, pero sigue alimentando con nuevos bytes para mantener viva la conexión"
    }
  ],
  "lastModified": "2026-06-17T04:05:58.370",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:cloudflare:octorpki:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A39C112F-E066-40D1-9CAC-9D9F89B467EE",
              "versionEndExcluding": "1.3.0"
            }
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          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
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            }
          ],
          "operator": "OR"
        }
      ]
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  ],
  "sourceIdentifier": "cna@cloudflare.com"
}