Medium severity · published Apr 9, 2026
CVE-2026-21915
JSI Virtual Lightweight Collector: Shell escape allows privilege escalation to root
6.7
CVSS
2.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.2% · higher than 83% 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-2026-21915
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-21915
Vendor Advisory
https://kb.juniper.net/JSA106016
More from JSI LWC
9.8
CVE-2026-33784
JSI Virtual Lightweight Collector: Default password is not required to be changed which allows unauthorized high-privileged access