Critical severity · published Apr 9, 2026
CVE-2026-33784
JSI Virtual Lightweight Collector: Default password is not required to be changed which allows unauthorized high-privileged access
9.8
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 39% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JL
JSI LWC · Juniper Networks
before 3.0.94 · source: vendor
VL
Virtual Lightweight Collector · Juniper
before 3.0.94 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33784
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33784
Vendor Advisory
https://kb.juniper.net/JSA107871
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JSI Virtual Lightweight Collector: Shell escape allows privilege escalation to root