FKIE_CVE-2026-21909
Vulnerability from fkie_nvd - Published: 2026-01-15 21:16 - Updated: 2026-01-23 19:40
Severity ?
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
| URL | Tags | ||
|---|---|---|---|
| sirt@juniper.net | https://kb.juniper.net/JSA106008 | Vendor Advisory | |
| sirt@juniper.net | https://supportportal.juniper.net/JSA106008 | Vendor 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 |
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"cveTags": [],
"descriptions": [
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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.\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": "CVE-2026-21909",
"lastModified": "2026-01-23T19:40:48.193",
"metrics": {
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{
"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"
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"exploitabilityScore": 2.8,
"impactScore": 3.6,
"source": "sirt@juniper.net",
"type": "Primary"
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"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",
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"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "GREEN",
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"subConfidentialityImpact": "NONE",
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"userInteraction": "NONE",
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"version": "4.0",
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"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "MODERATE"
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"source": "sirt@juniper.net",
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"published": "2026-01-15T21:16:06.727",
"references": [
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"source": "sirt@juniper.net",
"tags": [
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"url": "https://kb.juniper.net/JSA106008"
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"tags": [
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"lang": "en",
"value": "CWE-401"
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"source": "sirt@juniper.net",
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}
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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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