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CVE-2026-21909

Estado: AnalizadaAlta (7.1)—

A Missing Release of Memory after Effective Lifetime vulnerability in the routing protocol daemon (rpd) Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated attacker controlling an adjacent IS-IS neighbor to send a specific update packet causing a memory leak. Continued receipt and processing of these packets will exhaust all available memory, crashing rpd and creating a Denial of Service (DoS) condition.

Memory usage can be monitored through the use of the 'show task memory detail' command. For example:

user@junos> show task memory detail | match ted-infra   TED-INFRA-COOKIE           25   1072     28   1184     229

Leer descripción completaMostrar menos

user@junos>

show task memory detail | match ted-infra   TED-INFRA-COOKIE           31   1360     34   1472     307

This issue affects:

Junos OS:

Junos OS Evolved:

This issue does not affect Junos OS versions before 23.2R1 or Junos OS Evolved versions before 23.2R1-EVO.

Detalles técnicos trazas, registros y código del informe original
  *  from 23.2 before 23.2R2, 
  *  from 23.4 before 23.4R1-S2, 23.4R2, 
  *  from 24.1 before 24.1R2;

  *  from 23.2 before 23.2R2-EVO, 
  *  from 23.4 before 23.4R1-S2-EVO, 23.4R2-EVO, 
  *  from 24.1 before 24.1R2-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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Acceso red adyacente (AV:A) sin autenticación contra daemon rpd. El ataque causa agotamiento de memoria y crash del servicio (DoS), clasificado como T1499.004 (resource exhaustion).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningThreat Intelligence ProgramPrivileged Account ManagementNetwork SegmentationFilter Network TrafficDisable or Remove Feature or Program

Tecnologías afectadas (2)

Juniper — JunosJuniper — Junos OS Evolved

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-21909",
  "cveTags": [],
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          "id": "CVE-2026-21909",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-01-15T20:52:37.531214Z"
        }
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    ],
    "cvssMetricV31": [
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        "source": "sirt@juniper.net",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 6.5,
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          "vectorString": "CVSS:3.1/AV:A/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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        "exploitabilityScore": 2.8
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        "source": "sirt@juniper.net",
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          "version": "4.0",
          "Recovery": "AUTOMATIC",
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          "subIntegrityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "integrityRequirement": "NOT_DEFINED",
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          "vulnAvailabilityImpact": "HIGH",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
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          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
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          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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              "version": "23.2",
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  "published": "2026-01-15T21:16:06.727",
  "references": [
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      "url": "https://kb.juniper.net/JSA106008",
      "tags": [
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      ],
      "source": "sirt@juniper.net"
    },
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      "tags": [
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      "source": "sirt@juniper.net",
      "description": [
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          "lang": "en",
          "value": "CWE-401"
        }
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      "lang": "en",
      "value": "A Missing Release of Memory after Effective Lifetime vulnerability in the routing protocol daemon (rpd) Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated attacker controlling an adjacent IS-IS neighbor to send a specific update packet causing a memory leak. Continued receipt and processing of these packets will exhaust all available memory, crashing rpd and creating a Denial of Service (DoS) condition.\n\nMemory usage can be monitored through the use of the 'show task memory detail' command. For example:\n\nuser@junos> show task memory detail | match ted-infra\n  TED-INFRA-COOKIE             25     1072       28     1184       229\n\n\n\nuser@junos> \n\nshow task memory detail | match ted-infra\n  TED-INFRA-COOKIE             31     1360       34     1472       307\n\nThis issue affects:\n\nJunos OS: \n\n  *  from 23.2 before 23.2R2, \n  *  from 23.4 before 23.4R1-S2, 23.4R2, \n  *  from 24.1 before 24.1R2; \n\n\nJunos OS Evolved: \n\n  *  from 23.2 before 23.2R2-EVO, \n  *  from 23.4 before 23.4R1-S2-EVO, 23.4R2-EVO, \n  *  from 24.1 before 24.1R2-EVO.\n\n\nThis issue does not affect Junos OS versions before 23.2R1 or Junos OS Evolved versions before 23.2R1-EVO."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de Missing Release of Memory after Effective Lifetime en el demonio del protocolo de enrutamiento (rpd) de Juniper Networks Junos OS y Junos OS Evolved permite a un atacante no autenticado que controla un vecino IS-IS adyacente enviar un paquete de actualización específico causando una fuga de memoria. La recepción y el procesamiento continuos de estos paquetes agotarán toda la memoria disponible, bloqueando rpd y creando una condición de denegación de servicio (DoS).\n\nEl uso de la memoria se puede monitorear mediante el uso del comando 'show task memory detail'. Por ejemplo:\n\nuser@junos> show task memory detail | match ted-infra\n  TED-INFRA-COOKIE             25     1072       28     1184       229\n\n\n\nuser@junos> \n\nshow task memory detail | match ted-infra\n  TED-INFRA-COOKIE             31     1360       34     1472       307\n\nEste problema afecta a:\n\nJunos OS:\n\n  *  desde 23.2 anterior a 23.2R2,\n  *  desde 23.4 anterior a 23.4R1-S2, 23.4R2,\n  *  desde 24.1 anterior a 24.1R2;\n\nJunos OS Evolved:\n\n  *  desde 23.2 anterior a 23.2R2-EVO,\n  *  desde 23.4 anterior a 23.4R1-S2-EVO, 23.4R2-EVO,\n  *  desde 24.1 anterior a 24.1R2-EVO.\n\nEste problema no afecta a las versiones de Junos OS anteriores a 23.2R1 ni a las versiones de Junos OS Evolved anteriores a 23.2R1-EVO."
    }
  ],
  "lastModified": "2026-06-17T10:19:08.240",
  "configurations": [
    {
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        {
          "negate": false,
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