Juniper Junos OS CVE-2026-21909: IS-IS Update Packet Causes RPD Crash DoS via Memory Leak

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Security AdvisoryCVE-2026-21909MediumJuniper Networks

Affected:

Junos OS 23.2
Junos OS 23.4
Junos OS 24.1
Junos OS Evolved 23.2
Junos OS Evolved 23.4

Fixed in:

Junos OS 23.2R2
Junos OS 23.4R1-S2
Junos OS 23.4R2
Junos OS 24.1R2
Junos OS 24.2R1

Referenced CVEs: CVE-2026-21909 · 6.5

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