---
id: CVE-2026-21915
title: >-
  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 acce…
summary: >-
  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 acce…
severity: medium
cvss: 6.7
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-183
  - CWE-78
vendor: juniper
product: virtual_lightweight_collector
affected:
  - virtual_lightweight_collector < 3.0.94
patched:
  - virtual_lightweight_collector 3.0.94
published: '2026-04-09'
updated: '2026-07-08'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-21915'
references:
  - url: 'https://kb.juniper.net/JSA106016'
    label: sirt@juniper.net
tags:
  - nvd
epss: 0.0224
epssPercentile: 0.8212
ingestedAt: '2026-07-08T03:46:38.626Z'
---

## Overview

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

- `virtual_lightweight_collector < 3.0.94`

## Remediation

Upgrade past the affected range:

- `virtual_lightweight_collector 3.0.94`