Product Affected

This issue affects all versions of Junos OS and Junos OS Evolved.
Medium

CVSS: v3.1: 5.1 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:L) 
CVSS: v4.0: 6.8 (CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/R:U/RE:M) 

Problem

An Improper Neutralization of Delimiters vulnerability in the UI of Juniper Networks Junos OS and Junos OS Evolved allows a local, authenticated attacker with high privileges to modify the system configuration.

 

A user with limited configuration and commit permissions, using a specifically crafted annotate configuration command, can change any part of the device configuration.

 

This issue affects:

 Junos OS: 

  • all versions before 22.2R3-S7,
  • 22.4 versions before 22.4R3-S7,
  • 23.2 versions before 23.2R2-S4,
  • 23.4 versions before 23.4R2-S4,
  • 24.2 versions before 24.2R2-S1,
  • 24.4 versions before 24.4R1-S2, 24.4R2;

 

Junos OS Evolved:

  • all versions before 22.4R3-S7-EVO,
  • 23.2-EVO versions before 23.2R2-S4-EVO,
  • 23.4-EVO versions before 23.4R2-S5-EVO, 
  • 24.2-EVO versions before 24.2R2-S1-EVO
  • 24.4-EVO versions before 24.4R2-EVO.

 

 

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

 

This issue was discovered during external security research.

Solution

The following software releases have been updated to resolve this specific issue:
Junos OS Evolved: 22.4R3-S7-EVO, 23.2R2-S4-EVO, 23.4R2-S5-EVO, 24.2R2-S1-EVO, 24.4R2-EVO, 25.2R1-EVO;
Junos OS: 22.2R3-S7, 22.4R3-S7, 23.2R2-S4, 23.4R2-S4, 24.2R2-S1, 24.4R1-S2, 24.4R2, 25.2R1, and all subsequent releases.

 

This issue is being tracked as 1860340 which is visible on the Customer Support website.

 

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

Workaround

There are no known workarounds for this issue.

To reduce the risk of exploitation use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators.

Severity Assessment

Information for how Juniper Networks uses CVSS can be found at KB 16446 [juniper.net] "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

Modification History

2025-07-09: Initial Publication

2025-09-24: Changed workaround to none

Related Information

Acknowledgements

Juniper SIRT would like to acknowledge and thank Vincent Szurma (vszurma) – Independent IT and Security Consultant for responsibly reporting this vulnerability.