CVE-2026-101956

Summary

An unauthenticated remote attacker can execute arbitrary Junos commands with root privileges through the exposed J-Web web interface due to improper authentication implementation.

Exploitability

Exploitation is straightforward with no prerequisites as the vulnerability allows remote execution without authentication, requiring only access to the J-Web interface.

Blast radius

The flaw could impact a large number of Juniper routers and switches running vulnerable Junos OS versions, potentially allowing attackers to gain full system control across multiple network devices.

Detection

Monitor for unauthorized access attempts to the J-Web interface (typically port 80 or 443) and look for suspicious command execution patterns in system logs, particularly those showing root-level command invocations from unauthenticated sessions.

Prioritized remediation

Disable the J-Web web management interface immediately or upgrade to Junos OS version 22.4R3 or later.

Analysis generated locally by garnet-coder (no data left the box). AI-assisted — verify against primary sources before acting.