CVE-2026-21915: Juniper Virtual Lightweight Collector

Medium severity, CVSS 6.7. EPSS: 2.2% chance of exploitation in the next 30 days.

A Permissive List of Allowed Input vulnerability in the CLI of Juniper Networks Support Insights (JSI) Virtual Lightweight Collector (vLWC) allows a local, high privileged attacker to escalate their privileges to root. The CLI menu accepts input without carefully validating it, which allows for shell command injection. These shell commands are executed with root permissions and can be used to gain complete control of the system. This issue affects all JSI vLWC versions before 3.0.94.

Affected products

• Juniper Virtual Lightweight Collector: before 3.0.94 (fixed in 3.0.94)

Published 2026-04-09. Last modified 2026-07-08.