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.
Metrics
Affected Vendors & Products
No advisories yet.
Solution
The following software releases have been updated to resolve this specific issue: Junos OS Evolved: 22.4R3-S8-EVO, 23.2R2-S5-EVO, 23.4R2-EVO, 24.2R1-EVO, and all subsequent releases; Junos OS: 22.4R3-S8, 23.2R2-S5, 23.4R2, 24.2R1, and all subsequent releases.
Workaround
There are no known workarounds for this issue.
Thu, 15 Jan 2026 21:15:00 +0000
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| Metrics |
ssvc
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Thu, 15 Jan 2026 20:45:00 +0000
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| Description | 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. | |
| Title | Junos OS and Junos OS Evolved: When telemetry collectors are frequently subscribing and unsubscribing to sensors chassisd or rpd will crash | |
| Weaknesses | CWE-416 | |
| References |
| |
| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: juniper
Published:
Updated: 2026-01-15T20:55:25.182Z
Reserved: 2026-01-05T17:32:48.712Z
Link: CVE-2026-21921
Updated: 2026-01-15T20:55:21.520Z
Status : Received
Published: 2026-01-15T21:16:08.400
Modified: 2026-01-15T21:16:08.400
Link: CVE-2026-21921
No data.
OpenCVE Enrichment
No data.