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CVE-2026-21921

Junos OS and Junos OS Evolved: When telemetry collectors are frequently subscribing and unsubscribing to sensors chassisd or rpd will crash PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
Juniper Networks / Junos OSaffected 0 before 22.4R3-S8; affected 23.2 before 23.2R2-S5; affected 23.4 before 23.4R2
Juniper Networks / Junos OS Evolvedaffected 0 before 22.4R3-S8-EVO; affected 23.2 before 23.2R2-S5-EVO; affected 23.4 before 23.4R2-EVO

CWE

CWE-416

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.