Riskcovery

CVE-2026-21916

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

State
Published
Severity
7.0 High
Published
Apr 9, 2026
Updated
Apr 13, 2026
Reserved
Jan 5, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
4.07.0 HighCVSS: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:Mjuniper
3.17.3 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:Hjuniper

Weaknesses

  • CWE-61 UNIX Symbolic Link (Symlink) Following

Affected Products

ProductVersions
Junos OSJuniper Networks
  • before 23.2R2-S7Affected
  • 23.4 to before 23.4R2-S6Affected
  • 24.2 to before 24.2R2-S3Affected
  • 24.4 to before 24.4R2-S2Affected
  • 25.2 to before 25.2R2Affected
  • 25.4R1Not affected

References

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