CVE-2026-21915

MEDIUM

JSI Virtual Lightweight Collector: Shell escape allows privilege escalation to root

Title source: cna

Description

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.

References (1)

Core 1

Core References

Vendor Advisory vendor-advisory

https://kb.juniper.net/JSA106016

Scores

CVSS v3 6.7

EPSS 0.0224

EPSS Percentile 80.8%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-183 CWE-78

Status published

Products (2)

juniper/virtual_lightweight_collector < 3.0.94

Juniper Networks/JSI LWC < 3.0.94

Published Apr 09, 2026

Tracked Since Apr 10, 2026