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CVE-2021-21419

Estado: ModificadaMedia (5.3)—

Eventlet es una biblioteca de redes concurrentes para Python. Un peer de websocket puede agotar la memoria en el lado de Eventlet mediante el envío de tramas de websocket muy grandes. Los peers maliciosos pueden agotar la memoria en el lado de Eventlet mediante el envío de tramas de datos altamente comprimido. Un parche en la versión 0.31.0 restringe la trama de websocket a límites razonables. Como solución alternativa, restringir el uso de la memoria por medio de los límites del sistema operativo ayudaría contra el agotamiento general de la máquina, pero no hay una solución para proteger el proceso de Eventlet

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)

Eventlet — EventletFedoraproject — Fedora

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-21419",
  "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
      }
    ],
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        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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        "impactScore": 1.4,
        "exploitabilityScore": 3.9
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  "affected": [
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      "source": "security-advisories@github.com",
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          "vendor": "eventlet",
          "product": "eventlet",
          "versions": [
            {
              "status": "affected",
              "version": ">= 0.10, < 0.31.0"
            }
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  "published": "2021-05-07T15:15:07.407",
  "references": [
    {
      "url": "https://github.com/eventlet/eventlet/security/advisories/GHSA-9p9m-jm8w-94p2",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2WJFSBPLCNSZNHYQC4QDRDFRTEZRMD2L/",
      "source": "security-advisories@github.com"
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      "source": "security-advisories@github.com"
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Eventlet is a concurrent networking library for Python. A websocket peer may exhaust memory on Eventlet side by sending very large websocket frames. Malicious peer may exhaust memory on Eventlet side by sending highly compressed data frame. A patch in version 0.31.0 restricts websocket frame to reasonable limits. As a workaround, restricting memory usage via OS limits would help against overall machine exhaustion, but there is no workaround to protect Eventlet process."
    },
    {
      "lang": "es",
      "value": "Eventlet es una biblioteca de redes concurrentes para Python.&#xa0;Un peer de websocket puede agotar la memoria en el lado de Eventlet mediante el envío de tramas de websocket muy grandes.&#xa0;Los peers maliciosos pueden agotar la memoria en el lado de Eventlet mediante el envío de tramas de datos altamente comprimido.&#xa0;Un parche en la versión 0.31.0 restringe la trama de websocket a límites razonables.&#xa0;Como solución alternativa, restringir el uso de la memoria por medio de los límites del sistema operativo ayudaría contra el agotamiento general de la máquina, pero no hay una solución para proteger el proceso de Eventlet"
    }
  ],
  "lastModified": "2026-06-17T03:35:32.337",
  "configurations": [
    {
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        {
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