An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a limited information disclosure and availability impact to the device.

Due to a wrong initialization, a process which should only be able to communicate internally within the device can be reached over the network via an open port. This leads to a device being inadvertently exposed and increased CPU cycles spent processing ingress packets.

This issue affects Junos OS Evolved:

• All versions before 23.2R2-S7.7-EVO;
• 23.4 versions before 23.4R2-S8.11-EVO;
• 24.2 versions before 24.2R2-S5.6-EVO;
• 24.4 versions before 24.4R2-S4-EVO;
• 25.2 version before 25.2R2-S1-EVO;
• 25.4 versions before 25.4R1-S1-EVO.

Please note that this issue is similar to but not identical CVE-2026-33803.

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

This issue was found during internal product security testing or research.

This issue has been assigned CVE-2026-102085.

The following software releases have been updated to resolve this specific issue: Junos OS Evolved: 23.2R2-S7.7-EVO, 23.4R2-S8.11-EVO, 24.2R2-S5.6-EVO, 24.4R2-S4-EVO, 25.2R2-S1-EVO, 25.4R1-S1-EVO, 26.2R1-EVO, and all subsequent releases.

Note: For Junos OS Evolved releases 23.2-EVO, 23.4-EVO, and 24.2-EVO, specific respins have been referenced. Previously published versions of these releases have been rebuilt to resolve the security vulnerabilities identified in this advisory.

This issue is being tracked as 1909910 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).

There are no known workarounds for this issue. Please ensure that your control plane protection only explicitly permits access to ports intended to be reachable and only from authorized endpoints. All other traffic destined to the control plane should be disallowed.

2026-10-14: Initial Publication

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team