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CVE-2026-21915

HIGH CVSS 4.0: 8.4 EPSS 0.05%
Updated Apr 09, 2026
Juniper
Parameter Value
CVSS 8.4 (HIGH)
Affected Versions before 3.0.94.
Type CWE-183
Vendor Juniper
Public PoC No

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.

Attack Parameters

Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
High
Admin privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v4.0

Weakness Type (CWE)