Product Affected

This issue affects all versions of Junos OS. Affected platforms: SRX Series.
Medium

CVSS: v3.1: 6.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N) 
CVSS: v4.0: 8.3 (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/RE:M) 

Problem

An Improper Following of a Certificate's Chain of Trust vulnerability in J-Web of Juniper Networks Junos OS on SRX Series allows a PITM to intercept the communication of the device and get access to confidential information and potentially modify it.

When an SRX device is provisioned to connect to Security Director (SD) cloud, it doesn't perform sufficient verification of the received server certificate. This allows a PITM to intercept the communication between the SRX and SD cloud and access credentials and other sensitive information.

This issue affects Junos OS:

  • all versions before 22.4R3-S9,
  • 23.2 versions before 23.2R2-S6,
  • 23.4 versions before 23.4R2-S7,
  • 24.2 versions before 24.2R2-S3,
  • 24.4 versions before 24.4R2-S2,
  • 25.2 versions before 25.2R1-S2, 25.2R2.

 

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: 22.4R3-S9, 23.2R2-S6, 23.4R2-S7, 24.2R2-S3, 24.4R2-S2, 25.2R1-S2, 25.2R2, 25.4R1, and all subsequent releases.

 

This issue is being tracked as 1877553 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. 

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

2026-04-08: Initial Publication

Related Information

Acknowledgements

Juniper SIRT would like to acknowledge and thank Konrad Porzezynski for responsibly reporting this vulnerability.