CVE-2026-21915: A Permissive List of Allowed Input vulnerability in the CLI of Juniper Networks Support Insights (JSI) Virtual

Q: How do I fix CVE-2026-21915?

virtual lightweight collector: upgrade to 3.0.94. Exact commands for each OS are on this page.

Q: Is CVE-2026-21915 being exploited?

CVE-2026-21915 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-21915 affect?

CVE-2026-21915 affects virtual lightweight collector. Severity is medium (CVSS 6.7). 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

Q: How urgent is CVE-2026-21915?

Priority 44/100. No elevated risk signals yet.

This month

MEDIUM 6.7UPGRADE

CVE-2026-21915 is a medium-severity flaw (CVSS 6.7) affecting virtual lightweight collector. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 affe

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.7 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	2.2% (top 17%)
CISA exploited list	No
Weakness	CWE-183, CWE-78
Published	2026-04-09
Last modified	2026-10-26

Publisher (CNA): Juniper Networks, Inc. · Vendor: juniper

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-09 22:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

juniper virtual lightweight collector UPGRADE

Affected: < 3.0.94

Fixed in: 3.0.94

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy virtual-lightweight-collector || rpm -q virtual-lightweight-collector || virtual-lightweight-collector --version

2. UPGRADE to 3.0.94 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade virtual-lightweight-collector

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade virtual-lightweight-collector

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-21915?

virtual lightweight collector: upgrade to 3.0.94. Exact commands for each OS are on this page.

Is CVE-2026-21915 being exploited?

CVE-2026-21915 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-21915 affect?

CVE-2026-21915 affects virtual lightweight collector. Severity is medium (CVSS 6.7). 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

How urgent is CVE-2026-21915?

Priority 44/100. No elevated risk signals yet.

Software pages

Juniper Junos vulnerabilities

Related CVEs

CVE-2026-33784 CRITICAL 9.8 UPGRADE A Use of Default Password vulnerability in the Juniper Networks Support Insights (JSI) Virtual Lightweight

References

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