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CVE-2021-31353

Estado: ModificadaAlta (7.5)—

An Improper Handling of Exceptional Conditions vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an attacker to inject a specific BGP update, causing the routing protocol daemon (RPD) to crash and restart, leading to a Denial of Service (DoS). Continued receipt and processing of the BGP update will create a sustained Denial of Service (DoS) condition.

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This issue affects very specific versions of Juniper Networks Junos OS: 19.3R3-S2; 19.4R3-S3; 20.2 versions 20.2R2-S3 and later, prior to 20.2R3-S2; 20.3 versions 20.3R2 and later, prior to 20.3R3; 20.4 versions 20.4R2 and later, prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS 20.1 is not affected by this issue. This issue also affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO versions prior to 21.1R2-EVO; 21.2-EVO versions prior to 21.2R2-EVO.

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)

Juniper — JunosJuniper — Junos OS Evolved

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-31353",
  "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": [
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        "type": "Secondary",
        "source": "sirt@juniper.net",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
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  "affected": [
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      "affectedData": [
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          "vendor": "Juniper Networks",
          "product": "Junos OS",
          "versions": [
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              "version": "unspecified",
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              "version": "19.4R3-S3"
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              "version": "20.1R1",
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              "version": "21.1-EVO",
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  ],
  "published": "2021-10-19T19:15:08.720",
  "references": [
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      "url": "https://kb.juniper.net/JSA11218",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ],
      "source": "sirt@juniper.net"
    },
    {
      "url": "https://kb.juniper.net/JSA11218",
      "tags": [
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        "Mitigation",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Secondary",
      "source": "sirt@juniper.net",
      "description": [
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          "lang": "en",
          "value": "CWE-755"
        }
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    {
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      "source": "nvd@nist.gov",
      "description": [
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  "descriptions": [
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      "lang": "en",
      "value": "An Improper Handling of Exceptional Conditions vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an attacker to inject a specific BGP update, causing the routing protocol daemon (RPD) to crash and restart, leading to a Denial of Service (DoS). Continued receipt and processing of the BGP update will create a sustained Denial of Service (DoS) condition. This issue affects very specific versions of Juniper Networks Junos OS: 19.3R3-S2; 19.4R3-S3; 20.2 versions 20.2R2-S3 and later, prior to 20.2R3-S2; 20.3 versions 20.3R2 and later, prior to 20.3R3; 20.4 versions 20.4R2 and later, prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS 20.1 is not affected by this issue. This issue also affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO versions prior to 21.1R2-EVO; 21.2-EVO versions prior to 21.2R2-EVO."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de administración inapropiada de condiciones excepcionales en Juniper Networks Junos OS y Junos OS Evolved permite a un atacante inyectar una actualización BGP específica, causando el bloqueo y el reinicio del demonio del protocolo de enrutamiento (RPD), conllevando a una Denegación de Servicio (DoS). Si se sigue recibiendo y procesando la actualización BGP, será creada una condición de Denegación de Servicio (DoS) sostenida. Este problema afecta a versiones muy específicas de Juniper Networks Junos OS: 19.3R3-S2; 19.4R3-S3; 20.2 versiones 20.2R2-S3 y posteriores, anteriores a 20.2R3-S2; 20.3 versiones 20.3R2 y posteriores, anteriores a 20.3R3; 20.4 versiones 20.4R2 y posteriores, anteriores a 20.4R3; versiones 21.1 anteriores a 21.1R2. Juniper Networks Junos OS 20.1 no está afectado por este problema. Este problema también afecta a Juniper Networks Junos OS Evolved: Todas las versiones anteriores a 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO versiones anteriores a 21.1R2-EVO; 21.2-EVO versiones anteriores a 21.2R2-EVO"
    }
  ],
  "lastModified": "2026-06-17T03:51:36.277",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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  "sourceIdentifier": "sirt@juniper.net"
}