CVE-2026-21909 (GCVE-0-2026-21909)

Vulnerability from cvelistv5 – Published: 2026-01-15 20:22 – Updated: 2026-01-15 20:52
VLAI
Title
Junos OS and Junos OS Evolved: Receipt of specific IS-IS update packet causes memory leak leading to RPD crash
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.
Severity
6.5 (Medium)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.1 (High)
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/AU:Y/R:A/V:C/RE:M/U:Green
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-15 20:52 UTC
CWE
  • CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
juniper CNA under the mitre root
CNA scorecard B 85/100 over 175 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Juniper Networks Junos OS Affected: 23.2 , < 23.2R2 (semver)
Affected: 23.4 , < 23.4R1-S2, 23.4R2 (semver)
Affected: 24.1 , < 24.1R2 (semver)
Unaffected: 0 , < 23.2R1 (semver)
guessed Create a notification for this product.
Juniper Networks Junos OS Evolved Affected: 23.2 , < 23.2R2-EVO (semver)
Affected: 23.4 , < 23.4R1-S2-EVO, 23.4R2-EVO (semver)
Affected: 24.1 , < 24.1R2-EVO (semver)
Unaffected: 0 , < 23.2R1-EVO (semver)
guessed Create a notification for this product.
Date Public
2026-01-14 17:00
Show details on NVD website
To clipboard 

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                    "matchCriteriaId": "8E41F858-24E8-4986-BED6-BE5151219DEC",
                    "vulnerable": true
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                  {
                    "criteria": "cpe:2.3:o:juniper:junos_os_evolved:24.1:r1:*:*:*:*:*:*",
                    "matchCriteriaId": "EE57490C-2800-4456-8293-B54A255CF348",
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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": [
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              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "ADJACENT_NETWORK",
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              "exploitabilityScore": 2.8,
              "impactScore": 3.6,
              "source": "sirt@juniper.net",
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          "cvssMetricV40": [
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                "modifiedUserInteraction": "NOT_DEFINED",
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        "published": "2026-01-15T21:16:06.727",
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        "vulnStatus": "Analyzed",
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      "initial_release_date": "2026-01-14T17:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Junos OS and Junos OS Evolved: Receipt of specific IS-IS update packet causes memory leak leading to RPD crash",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21909.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
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            "metrics": [
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              "dateUpdated": "2026-01-15T20:52:39.114Z",
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                  "status": "affected",
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          "configurations": [
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                  "type": "text/html",
                  "value": "This issue affects systems with IS-IS configured. For example:\u003cbr\u003e\u003cbr\u003e\u003ctt\u003e[protocols isis interface lo.0 ...]\u003cbr\u003e\n\n[protocols isis interface \u0026lt;interface\u0026gt; ...]\u003cbr\u003e[interfaces \u0026lt;interface\u0026gt; unit \u0026lt;n\u0026gt; family iso]\u003c/tt\u003e"
                }
              ],
              "value": "This issue affects systems with IS-IS configured. For example:\n\n[protocols isis interface lo.0 ...]\n\n\n[protocols isis interface \u003cinterface\u003e ...]\n[interfaces \u003cinterface\u003e unit \u003cn\u003e family iso]"
            }
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          "datePublic": "2026-01-14T17:00:00.000Z",
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                  "type": "text/html",
                  "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.\u0026nbsp;Continued receipt and processing of these packets will exhaust all available memory, crashing rpd and creating a Denial of Service (DoS) condition.\u003cbr\u003e\u003cbr\u003eMemory usage can be monitored through the use of the \u0027show task memory detail\u0027 command. For example:\u003cbr\u003e\u003cbr\u003e\u003ctt\u003euser@junos\u0026gt; show task memory detail | match ted-infra\u003cbr\u003e\u0026nbsp; TED-INFRA-COOKIE  \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp;  25  \u0026nbsp;  1072  \u0026nbsp; \u0026nbsp;  28  \u0026nbsp;  1184  \u0026nbsp; \u0026nbsp;  229\u003cbr\u003e\u003c/tt\u003e\u003cbr\u003e\n\n\u003ctt\u003euser@junos\u0026gt; \n\nshow task memory detail | match ted-infra\u003cbr\u003e\u0026nbsp; TED-INFRA-COOKIE  \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp; \u0026nbsp;  \u003cb\u003e\u003cspan style=\"background-color: rgb(239, 250, 102);\"\u003e31\u003c/span\u003e\u003c/b\u003e  \u0026nbsp;  \u003cb\u003e\u003cspan style=\"background-color: rgb(239, 250, 102);\"\u003e1360\u003c/span\u003e\u003c/b\u003e  \u0026nbsp; \u0026nbsp;  34  \u0026nbsp;  1472  \u0026nbsp; \u0026nbsp;  307\u003c/tt\u003e\u003cbr\u003e\u003cbr\u003e\u003cp\u003eThis issue affects:\u003c/p\u003e\u003cp\u003eJunos OS:\u0026nbsp;\u003c/p\u003e\u003cul\u003e\u003cli\u003efrom 23.2 before 23.2R2,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 23.4 before 23.4R1-S2, 23.4R2,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 24.1 before 24.1R2;\u0026nbsp;\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eJunos OS Evolved:\u0026nbsp;\u003c/p\u003e\u003cul\u003e\u003cli\u003efrom 23.2 before 23.2R2-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 23.4 before 23.4R1-S2-EVO, 23.4R2-EVO,\u0026nbsp;\u003c/li\u003e\u003cli\u003efrom 24.1 before 24.1R2-EVO.\u003c/li\u003e\u003c/ul\u003eThis issue does not affect Junos OS versions before 23.2R1 or Junos OS Evolved versions before 23.2R1-EVO."
                }
              ],
              "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."
            }
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          "exploits": [
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}



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Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.