Nozomi Networks Guardian and CMC Arc Sensor CLI Privilege Assignment Vulnerability
An Incorrect Privilege Assignment vulnerability was discovered in the synchronization functionality due to Arc sensors receiving CLI permissions. An authenticated user with limited privileges can push administrative CLI commands through the sync, altering the device configuration, and/or affecting its availability.
Quick answer
Nozomi Networks Guardian and CMC should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Nozomi Networks Guardian before 26.2.0
- Nozomi Networks CMC before 26.2.0
Fixed versions
- 26.2.0
How to fix it
Nozomi Networks Guardian and CMC is affected by CVE-2026-33390. Guardian and CMC versions before 26.2.0 can assign CLI permissions to Arc sensors during synchronization, allowing limited users to push administrative CLI commands. Upgrade to 26.2.0 or apply Nozomi's mitigation.
- Inventory Nozomi Networks Guardian, CMC, and Arc sensor deployments.
- Upgrade Guardian and CMC to 26.2.0 or later.
- Apply Nozomi Networks mitigation from the vendor advisory if immediate upgrade is not possible.
- Restrict synchronization administration to trusted accounts and management networks.
- Review user roles and remove unnecessary limited users who can influence sensor synchronization.
- Audit CLI command history, configuration changes, and availability events for suspicious sync-driven activity.
- Back up validated device configuration before and after remediation.
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Verify the fix
- Confirm Guardian and CMC are running 26.2.0 or later.
- Attempt a safe limited-user synchronization test in staging and confirm administrative CLI commands cannot be pushed.
- Review audit logs for unexpected CLI commands or configuration changes during the exposure window.
- Confirm Arc sensor synchronization still works for legitimate administration after the update.
- Run a Fixnx scan and verify public management interfaces are not exposed.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-33390?
Nozomi Networks Guardian and CMC versions listed as affected should be reviewed: Nozomi Networks Guardian before 26.2.0, Nozomi Networks CMC before 26.2.0.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
Why can this risk appear in multiple categories?
A vulnerability can belong to more than one platform or ecosystem. Fixnx keeps one canonical risk page while also listing it in every relevant category.