FKIE_CVE-2026-21909

Vulnerability from fkie_nvd - Published: 2026-01-15 21:16 - Updated: 2026-06-17 10:19
Severity
6.5 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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 user@junos> show task memory detail | match ted-infra   TED-INFRA-COOKIE           31   1360     34   1472     307 This issue affects: Junos OS:  * from 23.2 before 23.2R2,  * from 23.4 before 23.4R1-S2, 23.4R2,  * from 24.1 before 24.1R2;  Junos OS Evolved:  * 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. This issue does not affect Junos OS versions before 23.2R1 or Junos OS Evolved versions before 23.2R1-EVO.
References
sirt@juniper.nethttps://kb.juniper.net/JSA106008Vendor Advisory
sirt@juniper.nethttps://supportportal.juniper.net/JSA106008Vendor Advisory
Impacted products
Vendor Product Version
juniper junos 23.2
juniper junos 23.2
juniper junos 23.2
juniper junos 23.2
juniper junos 23.4
juniper junos 23.4
juniper junos 23.4
juniper junos 23.4
juniper junos 24.1
juniper junos 24.1
juniper junos_os_evolved 23.2
juniper junos_os_evolved 23.2
juniper junos_os_evolved 23.2
juniper junos_os_evolved 23.2
juniper junos_os_evolved 23.4
juniper junos_os_evolved 23.4
juniper junos_os_evolved 23.4
juniper junos_os_evolved 23.4
juniper junos_os_evolved 24.1
juniper junos_os_evolved 24.1
To clipboard 

{
  "affected": [
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          "product": "Junos OS",
          "vendor": "Juniper Networks",
          "versions": [
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              "version": "0",
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    }
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          "negate": false,
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "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.\u00a0Continued 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 \u0027show task memory detail\u0027 command. For example:\n\nuser@junos\u003e show task memory detail | match ted-infra\n\u00a0 TED-INFRA-COOKIE  \u00a0 \u00a0 \u00a0 \u00a0 \u00a0  25  \u00a0  1072  \u00a0 \u00a0  28  \u00a0  1184  \u00a0 \u00a0  229\n\n\n\nuser@junos\u003e \n\nshow task memory detail | match ted-infra\n\u00a0 TED-INFRA-COOKIE  \u00a0 \u00a0 \u00a0 \u00a0 \u00a0  31  \u00a0  1360  \u00a0 \u00a0  34  \u00a0  1472  \u00a0 \u00a0  307\n\nThis issue affects:\n\nJunos OS:\u00a0\n\n  *  from 23.2 before 23.2R2,\u00a0\n  *  from 23.4 before 23.4R1-S2, 23.4R2,\u00a0\n  *  from 24.1 before 24.1R2;\u00a0\n\n\nJunos OS Evolved:\u00a0\n\n  *  from 23.2 before 23.2R2-EVO,\u00a0\n  *  from 23.4 before 23.4R1-S2-EVO, 23.4R2-EVO,\u00a0\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 actualizaci\u00f3n espec\u00edfico causando una fuga de memoria. La recepci\u00f3n y el procesamiento continuos de estos paquetes agotar\u00e1n toda la memoria disponible, bloqueando rpd y creando una condici\u00f3n de denegaci\u00f3n de servicio (DoS).\n\nEl uso de la memoria se puede monitorear mediante el uso del comando \u0027show task memory detail\u0027. Por ejemplo:\n\nuser@junos\u0026gt; show task memory detail | match ted-infra\n\u0026#xa0; TED-INFRA-COOKIE  \u0026#xa0; \u0026#xa0; \u0026#xa0; \u0026#xa0; \u0026#xa0;  25  \u0026#xa0;  1072  \u0026#xa0; \u0026#xa0;  28  \u0026#xa0;  1184  \u0026#xa0; \u0026#xa0;  229\n\n\n\nuser@junos\u0026gt; \n\nshow task memory detail | match ted-infra\n\u0026#xa0; TED-INFRA-COOKIE  \u0026#xa0; \u0026#xa0; \u0026#xa0; \u0026#xa0; \u0026#xa0;  31  \u0026#xa0;  1360  \u0026#xa0; \u0026#xa0;  34  \u0026#xa0;  1472  \u0026#xa0; \u0026#xa0;  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."
    }
  ],
  "id": "CVE-2026-21909",
  "lastModified": "2026-06-17T10:19:08.240",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "sirt@juniper.net",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "YES",
          "Recovery": "AUTOMATIC",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "ADJACENT",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "GREEN",
          "subAvailabilityImpact": "LOW",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "CONCENTRATED",
          "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:C/RE:M/U:Green",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "MODERATE"
        },
        "source": "sirt@juniper.net",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-21909",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-01-15T20:52:37.531214Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-01-15T21:16:06.727",
  "references": [
    {
      "source": "sirt@juniper.net",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://kb.juniper.net/JSA106008"
    },
    {
      "source": "sirt@juniper.net",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://supportportal.juniper.net/JSA106008"
    }
  ],
  "sourceIdentifier": "sirt@juniper.net",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-401"
        }
      ],
      "source": "sirt@juniper.net",
      "type": "Secondary"
    }
  ]
}



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