Vulnerability-Lookup

GHSA-CF3W-5GM7-WVP9

Vulnerability from github – Published: 2026-01-15 21:31 – Updated: 2026-01-15 21:31

Details

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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-21909"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-15T21:16:06Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-cf3w-5gm7-wvp9",
  "modified": "2026-01-15T21:31:48Z",
  "published": "2026-01-15T21:31:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21909"
    },
    {
      "type": "WEB",
      "url": "https://kb.juniper.net/JSA106008"
    },
    {
      "type": "WEB",
      "url": "https://supportportal.juniper.net/JSA106008"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-01-15 20:22 – Updated: 2026-01-15 20:52

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 mitre root

References

2 references

URL	Tags
https://supportportal.juniper.net/JSA106008	vendor-advisory
https://kb.juniper.net/JSA106008	vendor-advisory

Impacted products

2 products

Vendor	Product	Version
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)
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)

Date Public

2026-01-14 17:00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-21909",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-15T20:52:37.531214Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-15T20:52:42.400Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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              "status": "affected",
              "version": "23.4",
              "versionType": "semver"
            },
            {
              "lessThan": "24.1R2",
              "status": "affected",
              "version": "24.1",
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              "status": "unaffected",
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              "status": "affected",
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          "lang": "en",
          "supportingMedia": [
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              "base64": false,
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              "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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              "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."
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          "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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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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.