What is CVE-2026-21915?

CVE-2026-21915 is a medium-severity vulnerability in Juniper Virtual_lightweight_collector, classified under CWE-183. CVSS score: 6.7/10. Published 2026-04-09.

How severe is CVE-2026-21915?

Medium severity. CVSS v3 base score is 6.7 out of 10.

RCE in Juniper Virtual_lightweight_collector

CVE-2026-21915

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 accept…

EPSS: 0.022 (80.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Juniper Virtual_lightweight_collector
Juniper Networks Jsi Lwc — versions 0

Weakness classification (CWE)

CWE-183
CWE-78 — OS Command Injection

References

sirt@juniper.net (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-21915?: CVE-2026-21915 is a medium-severity vulnerability in Juniper Virtual_lightweight_collector, classified under CWE-183. CVSS score: 6.7/10. Published 2026-04-09.
How severe is CVE-2026-21915?: Medium severity. CVSS v3 base score is 6.7 out of 10.