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 validation of input in the CLI menu of Juniper Networks JSI vLWC, allowing shell command injection. An attacker with local high privileges can exploit this flaw to escalate privileges to root by injecting commands executed with root permissions. The issue 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 that the attack requires local access and high privileges but can result in complete confidentiality, integrity, and availability compromise.
Potential Impact
Successful exploitation allows a local attacker with high privileges to escalate to root, gaining complete control over the affected system. This includes full read, write, and execution capabilities, potentially leading to system takeover and disruption of services.
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 the CLI. 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 validation of input in the CLI menu of Juniper Networks JSI vLWC, allowing shell command injection. An attacker with local high privileges can exploit this flaw to escalate privileges to root by injecting commands executed with root permissions. The issue 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 that the attack requires local access and high privileges but can result in complete confidentiality, integrity, and availability compromise.
Potential Impact
Successful exploitation allows a local attacker with high privileges to escalate to root, gaining complete control over the affected system. This includes full read, write, and execution capabilities, potentially leading to system takeover and disruption of services.
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 the CLI. 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: 4/17/2026, 12:12:43 PM
Last updated: 5/25/2026, 12:22:36 PM
Views: 74
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