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CVE-2026-21916

Junos OS: A low privileged user can escalate their privileges so that they can login as root

Published: Apr 9, 2026Updated: Apr 17, 2026 Sources: CVE List NVDCWE-61
NVD MITRE
7.3CVSSHIGH
EPSS Score
0.1%
Top 97.2%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
Patch Available

Description

A UNIX Symbolic Link (Symlink) Following vulnerability in the CLI of Juniper Networks Junos OS allows a local, authenticated attacker with low privileges to escalate their privileges to root which will lead to a complete compromise of the system. When after a user has performed a specific 'file link ...' CLI operation, another user commits (unrelated configuration changes), the first user can login as root. This issue affects Junos OS: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S6, * 24.2 versions before 24.2R2-S3, * 24.4 versions before 24.4R2-S2, * 25.2 versions before 25.2R2. This issue does not affect versions 25.4R1 or later.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:RS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-61

Affected Products

Junos OSJuniper NetworksNetworking Infrastructure
junosjuniperNetworking Infrastructure
juniper networkscommercialUSNetworking Infrastructure
junipercommercialUSNetworking Infrastructureaka juniper networks, juniper networks inc.

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
Workaround Available

References

https://kb.juniper.net/JSA107807
kb.juniper.net

Timeline

Published
Apr 9, 2026
Last Updated
Apr 17, 2026

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