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Juniper Networks security patch release for CVE-2026-21902

Security Patch Release
First reported
Last updated
Happening score
H score 35
1 unique sources, 1 articles

Summary

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Juniper Networks has released fixes for CVE-2026-21902 in Junos OS Evolved on PTX Series routers, closing a flaw that could let an unauthenticated attacker run code as root. The vendor says fixed versions are 25.4R1-S1-EVO, 25.4R2-EVO, and 26.2R1-EVO. Administrators that cannot patch immediately should restrict access with firewall filters or ACLs, or disable the vulnerable service.

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Timeline

  1. 26.02.2026 18:42 2 articles · 4mo ago

    Juniper Networks publishes fixes for CVE-2026-21902

    Mitigation Patch Update

    Juniper Networks published fixes for CVE-2026-21902 affecting Junos OS Evolved on PTX Series routers, a flaw in the On-Box Anomaly Detection framework that could let an unauthenticated attacker reach an externally exposed port, execute code as root, and take full control of an affected device. Fixed releases are 25.4R1-S1-EVO, 25.4R2-EVO, and 26.2R1-EVO, and administrators unable to patch immediately were advised to restrict access with firewall filters or Access Control Lists (ACLs) or disable the vulnerable service with `request pfe anomalies disable`.

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