CVE-2026-21916 — Junos OS: A low privileged user can escalate their privileges so that they can login as root

Description (CNA)

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 (CNA)

Vendor / product	Versions
Juniper Networks / Junos OS	affected 0 before 23.2R2-S7; affected 23.4 before 23.4R2-S6; affected 24.2 before 24.2R2-S3; affected 24.4 before 24.4R2-S2; affected 25.2 before 25.2R2; unaffected 25.4R1

CWE

CWE-61

References

https://kb.juniper.net/JSA107807

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.