FKIE_CVE-2026-21921
Vulnerability from fkie_nvd - Published: 2026-01-15 21:16 - Updated: 2026-06-17 10:19
Severity
Summary
A Use After Free vulnerability in the chassis daemon (chassisd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based attacker authenticated with low privileges to cause a Denial-of-Service (DoS).
When telemetry collectors are frequently subscribing and unsubscribing to sensors continuously over a long period of time, telemetry-capable processes like chassisd, rpd or mib2d will crash and restart, which - depending on the process - can cause a complete outage until the system has recovered.
This issue affects:
Junos OS:
* all versions before 22.4R3-S8,
* 23.2 versions before 23.2R2-S5,
* 23.4 versions before 23.4R2;
Junos OS Evolved:
* all versions before 22.4R3-S8-EVO,
* 23.2 versions before 23.2R2-S5-EVO,
* 23.4 versions before 23.4R2-EVO.
References
| URL | Tags | ||
|---|---|---|---|
| sirt@juniper.net | https://kb.juniper.net/JSA106021 | Vendor Advisory | |
| sirt@juniper.net | https://supportportal.juniper.net/JSA106021 | Vendor Advisory |
Impacted products
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"value": "A Use After Free vulnerability in the chassis daemon (chassisd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based attacker authenticated with low privileges to cause a Denial-of-Service (DoS).\n\nWhen telemetry collectors are frequently subscribing and unsubscribing to sensors continuously over a long period of time, telemetry-capable processes like chassisd, rpd or mib2d will crash and restart, which - depending on the process - can cause a complete outage until the system has recovered.\n\nThis issue affects:\n\n\u00a0Junos OS:\u00a0\n\n\n\n * all versions before 22.4R3-S8,\n * 23.2 versions before 23.2R2-S5,\n * 23.4 versions before 23.4R2;\n\n\n\n\nJunos OS Evolved:\n\n\n\n * all versions before 22.4R3-S8-EVO,\n * 23.2 versions before 23.2R2-S5-EVO,\n * 23.4 versions before 23.4R2-EVO."
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"value": "Una vulnerabilidad de Uso Despu\u00e9s de Liberar en el demonio de chasis (chassisd) de Juniper Networks Junos OS y Junos OS Evolved permite a un atacante basado en red autenticado con bajos privilegios causar una Denegaci\u00f3n de Servicio (DoS).\n\nCuando los recolectores de telemetr\u00eda se suscriben y anulan la suscripci\u00f3n a sensores frecuentemente y de forma continua durante un largo per\u00edodo de tiempo, los procesos con capacidad de telemetr\u00eda como chassisd, rpd o mib2d se bloquear\u00e1n y reiniciar\u00e1n, lo cual - dependiendo del proceso - puede causar una interrupci\u00f3n completa hasta que el sistema se haya recuperado.\n\nEste problema afecta:\n\nJunos OS:\n\n * todas las versiones anteriores a 22.4R3-S8,\n * versiones 23.2 anteriores a 23.2R2-S5,\n * versiones 23.4 anteriores a 23.4R2;\n\nJunos OS Evolved:\n\n * todas las versiones anteriores a 22.4R3-S8-EVO,\n * versiones 23.2 anteriores a 23.2R2-S5-EVO,\n * versiones 23.4 anteriores a 23.4R2-EVO."
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"lastModified": "2026-06-17T10:19:10.153",
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]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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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.
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.
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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.
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