Junos OS and Junos OS Evolved: Privilege escalation to root via CLI command 'request system logout'

Summary

An Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in the CLI of Juniper Networks Junos OS and Junos OS Evolved allows a high privileged, local attacker to escalated their privileges to root. When a user provides specifically crafted arguments to the 'request system logout' command, these will be executed as root on the shell, which can completely compromise the device. This issue affects: Junos OS:  • all versions before 21.2R3-S9, • 21.4 versions before 21.4R3-S8, • 22.2 versions before 22.2R3-S6, • 22.3 versions before 22.3R3-S3, • 22.4 versions before 22.4R3-S6, • 23.2 versions before 23.2R2-S1, • 23.4 versions before 23.4R1-S2, 23.4R2; Junos OS Evolved: • all versions before 22.4R3-S6-EVO, • 23.2-EVO versions before 23.2R2-S1-EVO, • 23.4-EVO versions before 23.4R1-S2-EVO, 23.4R2-EVO.

Timeline

1. Jul 11, 2025, 3:11 PM UTCCVE published
2. Jul 12, 2025, 3:55 AM UTCCISA SSVC assessment

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

3. Feb 26, 2026, 5:50 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  fixed in 21.2R3-S9; From 21.4 · fixed in 21.4R3-S8; From 22.2 · fixed in 22.2R3-S6; From 22.3 · fixed in 22.3R3-S3; From 22.4 · fixed in 22.4R3-S6; From 23.2 · fixed in 23.2R2-S1

• Juniper Networks Junos OS Evolved

  fixed in 22.4R3-S6-EVO; From 23.2-EVO · fixed in 23.2R2-S1-EVO

References 1