Juniper Networks has released security updates to address a critical security flaw impacting Session Smart Router, Session Smart Conductor, and WAN Assurance Router products that could be exploited to hijack control of susceptible devices. Tracked as CVE-2025-21589, the vulnerability carries a CVSS v3.1 score of 9.8 and a CVS v4 score of 9.3. Session Smart Router: From 5.6.7 before 5.6.17, from 6.0.8, from 6.1 before 6.1.12-lts, from 6.2 before 6.2.8-lts, and from 6.3 before 6.3.3-r2, Session Smart Conductor: From 5.6.7 before 5.6.17, from 6.0.8, from 6.1 before 6.1.12-lts, from 6.2 before 6.2.8-lts, and from 6.3 before 6.3.3-r2, WAN Assurance Managed Routers: From 5.6.7 before 5.6.17, from 6.0.8, from 6.1 before 6.1.12-lts, from 6.2 before 6.2.8-lts, and from 6.3 before 6.3.3-r2. The flaw has been addressed in Session Smart Router versions SSR-5.6.17, SSR-6.1.12-lts, SSR-6.2.8-lts, SSR-6.3.3-r2, and later.

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