CVE-2026-21916
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Juniper Networks | Junos OS | 0 < 23.2R2-S7 | affected |
| Juniper Networks | Junos OS | 23.4 < 23.4R2-S6 | affected |
| Juniper Networks | Junos OS | 24.2 < 24.2R2-S3 | affected |
| Juniper Networks | Junos OS | 24.4 < 24.4R2-S2 | affected |
| Juniper Networks | Junos OS | 25.2 < 25.2R2 | affected |
| Juniper Networks | Junos OS | 25.4R1 | unaffected |
Weaknesses
- CWE-61: CWE-61 UNIX Symbolic Link (Symlink) Following
Workarounds
To prevent exploitation, use access controls to keep users from performing 'file link' operations.
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: total
References
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