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CVE-2020-8244

Estado: ModificadaMedia (6.5)—

Se presenta una vulnerabilidad de lectura excesiva del búfer en bl versiones anteriores a 4.0.3, versiones anteriores a 3.0.1, versiones anteriores a 2.2.1 versiones anteriores a 1.2.3 que podría permitir a un atacante suministrar información del usuario (incluso escrita) que si termina en el argumento de consume() y puede volverse negativa, el estado de BufferList puede estar corrupto, engañándolo para que exponga la memoria no inicializada por medio de llamadas regulares de .slice()

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)

Bufferlist Project — BufferlistDebian — Debian Linux

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2020-8244",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 6.4,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 4.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
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    "cvssMetricV31": [
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        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "support@hackerone.com",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "bl",
          "versions": [
            {
              "status": "affected",
              "version": "Fixed in 4.0.3, 3.0.1, 2.2.1, and 1.2.3"
            }
          ]
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  ],
  "published": "2020-08-30T15:15:12.167",
  "references": [
    {
      "url": "https://hackerone.com/reports/966347",
      "tags": [
        "Exploit",
        "Patch",
        "Third Party Advisory"
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      "source": "support@hackerone.com"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2021/06/msg00028.html",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
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      "source": "support@hackerone.com"
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    {
      "url": "https://hackerone.com/reports/966347",
      "tags": [
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        "Patch",
        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2021/06/msg00028.html",
      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "support@hackerone.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-126"
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      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
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      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A buffer over-read vulnerability exists in bl <4.0.3, <3.0.1, <2.2.1, and <1.2.3 which could allow an attacker to supply user input (even typed) that if it ends up in consume() argument and can become negative, the BufferList state can be corrupted, tricking it into exposing uninitialized memory via regular .slice() calls."
    },
    {
      "lang": "es",
      "value": "Se presenta una vulnerabilidad de lectura excesiva del búfer en bl versiones anteriores a 4.0.3, versiones anteriores a 3.0.1, versiones anteriores a 2.2.1 versiones anteriores a 1.2.3 que podría permitir a un atacante suministrar información del usuario (incluso escrita) que si termina en el argumento de consume() y puede volverse negativa, el estado de BufferList puede estar corrupto, engañándolo para que exponga la memoria no inicializada por medio de llamadas regulares de .slice()"
    }
  ],
  "lastModified": "2026-06-17T03:26:07.343",
  "configurations": [
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