Juniper Junos OS chassisd Use-After-Free Vulnerability (CVE-2026-21921) Security Bulletin

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Security AdvisoryCVE-2026-21921MediumJuniper Networks

Affected:

Junos OS all versions
Junos OS Evolved all versions

Fixed in:

Junos OS Evolved 22.4R3-S8-EVO, 23.2R2-S5-EVO, 23.4R2-EVO, 24.2R1-EVO and later
Junos OS 22.4R3-S8, 23.2R2-S5, 23.4R2, 24.2R1 and later

Referenced CVEs: CVE-2026-21921 · 6.5

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