Medium [CVE-2026-21915] 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
This medium-severity Juniper Networks advisory covers CVE-2026-21915; related products: EX.
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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 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 product named by the advisory: EX.
Affected product named by the advisory: EX.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 4 months ago·verify at source
- 3.0.94
Official advisory · high-confidence parse· fetched 4 months ago·verify at source
Mitigation
Upgrade to a fixed release: 3.0.94. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 4 months ago·verify at source
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