Affects widely deployed Juniper Session Smart routers; allows root file overwrite via unauthenticated API, risking network/device compromise and operational disruption.
CVE-2026-103401
Juniper Session Smart Router flaw lets local user overwrite files as root.
Is CVE-2026-103401 being exploited?
Not confirmed. CVE-2026-103401 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-103401?
CVE-2026-103401 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-103401?
Not known from our data. No patch reference has been recorded for CVE-2026-103401, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-103401 affect?
CVE-2026-103401 affects Juniper Session Smart Router (Mist-managed and unmanaged routers not onboarded to Conductor). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-103401?
Apply vendor updates when released; restrict API access and onboard routers to Conductor.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local unprivileged user can overwrite arbitrary files as root via unauthenticated web API, enabling privilege escalation, device compromise, or service disruption.
Patch when possible
- affected< 7.0.5
- affected>= 7.1.0 and < 7.1.7
- affected>= 7.2.0 and < 7.2.3
- affected< 7.0.5
- affected>= 7.1.0 and < 7.1.7
- affected>= 7.2.0 and < 7.2.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.