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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.

PUBLISHED Reserved 2026-01-05 | Published 2026-04-09 | Updated 2026-04-13 | Assigner juniper




HIGH: 7.3CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

HIGH: 7.0CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/AU:Y/R:U/RE:M

Problem types

CWE-61 UNIX Symbolic Link (Symlink) Following

Product status

Default status
unaffected

Any version before 23.2R2-S7
affected

23.4 (semver) before 23.4R2-S6
affected

24.2 (semver) before 24.2R2-S3
affected

24.4 (semver) before 24.4R2-S2
affected

25.2 (semver) before 25.2R2
affected

25.4R1
unaffected

References

kb.juniper.net/JSA107807 vendor-advisory

cve.org (CVE-2026-21916)

nvd.nist.gov (CVE-2026-21916)

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