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 ?
CWE
- CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
References
| URL | Tags | |||||||
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Impacted 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) |
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\"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"MODERATE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Juniper Networks\", \"product\": \"Junos OS\", \"versions\": [{\"status\": \"affected\", \"version\": \"23.2\", \"lessThan\": \"23.2R2\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"23.4\", \"lessThan\": \"23.4R1-S2, 23.4R2\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"24.1\", \"lessThan\": \"24.1R2\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"23.2R1\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"Juniper Networks\", \"product\": \"Junos OS Evolved\", \"versions\": [{\"status\": \"affected\", \"version\": \"23.2\", \"lessThan\": \"23.2R2-EVO\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"23.4\", \"lessThan\": \"23.4R1-S2-EVO, 23.4R2-EVO\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"24.1\", \"lessThan\": \"24.1R2-EVO\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"23.2R1-EVO\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"Juniper SIRT is not aware of any malicious exploitation of this vulnerability.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Juniper SIRT is not aware of any malicious exploitation of this vulnerability.\", \"base64\": false}]}], \"solutions\": [{\"lang\": \"en\", \"value\": \"The following software releases have been updated to resolve this specific issue:\\nJunos OS:\\u00a023.2R2, 23.4R1-S2, 23.4R2, 24.1R2, 24.2R1, and all subsequent releases.\\n\\n\\n Junos OS Evolved:\\u00a023.2R2-EVO, 23.4R1-S2-EVO, 23.4R2-EVO, 24.1R2-EVO, 24.2R1-EVO,\\u00a0and all subsequent releases.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"The following software releases have been updated to resolve this specific issue:\u003cbr\u003eJunos OS:\u0026nbsp;23.2R2, 23.4R1-S2, 23.4R2, 24.1R2, 24.2R1\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003e, and all subsequent releases.\u003c/span\u003e\\n\\n\u003cbr\u003e Junos OS Evolved:\u0026nbsp;23.2R2-EVO, 23.4R1-S2-EVO, 23.4R2-EVO, 24.1R2-EVO, 24.2R1-EVO,\u0026nbsp;\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003eand all subsequent releases.\u003c/span\u003e\\n\\n\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\", \"base64\": false}]}], \"datePublic\": \"2026-01-14T17:00:00.000Z\", \"references\": [{\"url\": \"https://supportportal.juniper.net/JSA106008\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://kb.juniper.net/JSA106008\", \"tags\": [\"vendor-advisory\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"There are no known workarounds for this issue.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"There are no known workarounds for this issue.\", \"base64\": false}]}], \"x_generator\": {\"engine\": \"Vulnogram 0.1.0-dev\"}, \"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.\", \"supportingMedia\": [{\"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.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-401\", \"description\": \"CWE-401 Missing Release of Memory after Effective Lifetime\"}]}], \"configurations\": [{\"lang\": \"en\", \"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]\", \"supportingMedia\": [{\"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\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"shortName\": \"juniper\", \"dateUpdated\": \"2026-01-15T20:22:44.674Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-21909\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-15T20:52:42.400Z\", \"dateReserved\": \"2026-01-05T17:32:48.710Z\", \"assignerOrgId\": \"8cbe9d5a-a066-4c94-8978-4b15efeae968\", \"datePublished\": \"2026-01-15T20:22:44.674Z\", \"assignerShortName\": \"juniper\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
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.
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