CVE-2026-33784

JSI Virtual Lightweight Collector: Default password is not required to be changed which allows unauthorized high-privileged access

Published Apr 9, 2026 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
Description
A Use of Default Password vulnerability in the Juniper Networks

Support Insights (JSI)

Virtual Lightweight Collector (vLWC) allows an unauthenticated, network-based attacker to take full control of the device.

vLWC software images ship with an initial password for a high privileged account. A change of this password is not enforced during the provisioning of the software, which can make full access to the system by unauthorized actors possible.This issue affects all versions of vLWC before 3.0.94.

Remediation

Vendor Solution

The following software releases have been updated to resolve this specific issue: 3.0.94, and all subsequent releases.


Vendor Workaround

The password can be changed in the setup menu of the device, which is described at  Configure Network Settings through JSI Shell | Juniper Support Insights | Juniper Networks https://www.juniper.net/documentation/us/en/software/jsi/vlwc-deploy/topics/topic-map/configure-settings-jsi-shell.html

Tracking

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Advisories

No advisories available
References
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Juniper Networks
Juniper Networks jsi Lwc
Vendors & Products Juniper Networks
Juniper Networks jsi Lwc
Type Values Removed Values Added
Description A Use of Default Password vulnerability in the Juniper Networks Support Insights (JSI) Virtual Lightweight Collector (vLWC) allows an unauthenticated, network-based attacker to take full control of the device. vLWC software images ship with an initial password for a high privileged account. A change of this password is not enforced during the provisioning of the software, which can make full access to the system by unauthorized actors possible.This issue affects all versions of vLWC before 3.0.94.
Title JSI Virtual Lightweight Collector: Default password is not required to be changed which allows unauthorized high-privileged access
Weaknesses CWE-1393
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/AU:Y/R:U/RE:L'}

Sources

Status
PUBLISHED
Assigner
juniper
Published
Updated
Apr 13, 2026, 6:06 PM
Reserved
Mar 23, 2026, 7:46 PM
Status
Analyzed
Published
Apr 9, 2026, 10:16 PM
Modified
Oct 26, 2026, 9:10 PM