CVE-2026-21915: CWE-183 Permissive List of Allowed Input in Juniper Networks JSI LWC
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.
AI Analysis
Technical Summary
This vulnerability arises from insufficient input validation in the CLI menu of Juniper Networks JSI vLWC, permitting shell command injection by a local attacker with high privileges. Exploitation allows escalation to root privileges, compromising system integrity, confidentiality, and availability. It affects all versions prior to 3.0.94. The CVSS vector (AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H) reflects local attack vector, low attack complexity, required high privileges, no user interaction, unchanged scope, and high impact on confidentiality, integrity, and availability. No vendor advisory or patch information is currently provided.
Potential Impact
Successful exploitation allows a local, high privileged attacker to execute arbitrary shell commands as root, resulting in full system compromise. This can lead to unauthorized access, data manipulation, and disruption of system availability. The vulnerability impacts all affected versions before 3.0.94 of JSI vLWC.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict local access to trusted users only and monitor for suspicious activity related to CLI usage. Avoid running vulnerable versions in untrusted environments.
CVE-2026-21915: CWE-183 Permissive List of Allowed Input in Juniper Networks JSI LWC
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises from insufficient input validation in the CLI menu of Juniper Networks JSI vLWC, permitting shell command injection by a local attacker with high privileges. Exploitation allows escalation to root privileges, compromising system integrity, confidentiality, and availability. It affects all versions prior to 3.0.94. The CVSS vector (AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H) reflects local attack vector, low attack complexity, required high privileges, no user interaction, unchanged scope, and high impact on confidentiality, integrity, and availability. No vendor advisory or patch information is currently provided.
Potential Impact
Successful exploitation allows a local, high privileged attacker to execute arbitrary shell commands as root, resulting in full system compromise. This can lead to unauthorized access, data manipulation, and disruption of system availability. The vulnerability impacts all affected versions before 3.0.94 of JSI vLWC.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict local access to trusted users only and monitor for suspicious activity related to CLI usage. Avoid running vulnerable versions in untrusted environments.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- juniper
- Date Reserved
- 2026-01-05T17:32:48.711Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d843721cc7ad14da3fb3fa
Added to database: 4/10/2026, 12:25:22 AM
Last enriched: 4/10/2026, 12:52:09 AM
Last updated: 4/10/2026, 8:14:26 AM
Views: 5
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