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.
References
| Link | Resource |
|---|---|
| https://kb.juniper.net/JSA107807 | Mitigation Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
26 Oct 2026, 21:10
| Type | Values Removed | Values Added |
|---|---|---|
| Summary |
|
Information
Published : 2026-04-09 22:16
Updated : 2026-10-26 21:10
NVD link : CVE-2026-21916
Mitre link : CVE-2026-21916
CVE.ORG link : CVE-2026-21916
JSON object : View
Products Affected
juniper
- junos
CWE
CWE-61
UNIX Symbolic Link (Symlink) Following
