CVE-2026-21915

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

Published Apr 9, 2026 CVSS 4.0 · 8.4 High EPSS 2.3% KEV · Not listed
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.

Remediation

Vendor Solution

The following software releases have been updated to resolve this specific issue: 3.0.94, and all subsequent releases.


Vendor Workaround

Use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators.

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
References
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Juniper Networks
Juniper Networks jsi Lwc
Vendors & Products Juniper Networks
Juniper Networks jsi Lwc
Type Values Removed Values Added
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.
Title JSI Virtual Lightweight Collector: Shell escape allows privilege escalation to root
Weaknesses CWE-183
References
Metrics cvssV3_1

{'score': 6.7, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.4, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/R:U/RE:M'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
juniper
Published
Updated
Apr 13, 2026, 1:04 PM
Reserved
Jan 5, 2026, 5:32 PM
Status
Analyzed
Published
Apr 9, 2026, 10:16 PM
Modified
Oct 26, 2026, 9:10 PM