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CVE-2026-21916

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 23.2R2-S7, 23.4R2-S6, 24.2R2-S3, 24.4R2-S2, 25.2R2
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Juniper Networks Junos OS

    fixed in 23.2R2-S7; From 23.4 · fixed in 23.4R2-S6; From 24.2 · fixed in 24.2R2-S3; From 24.4 · fixed in 24.4R2-S2; From 25.2 · fixed in 25.2R2

References 1

kb.juniper.net