CVE-2026-33390: Nozomi Networks Guardian and CMC privilege escalation in Arc sensors

CVE-2026-33390 · Severity: high · CVSS 8.1 · Published 2026-07-09

Nozomi Networks Guardian and CMC, which are used to monitor and manage industrial control systems, contain a security flaw in how they handle sensor synchronization. An attacker with low-level access to the system can exploit this to issue administrative commands, potentially changing critical device settings or causing a service outage. This could disrupt industrial operations or allow unauthorized changes to the security monitoring infrastructure.

Technologies: Nozomi Networks Guardian. Vendors: Nozomi Networks.

Quick answers

Is CVE-2026-33390 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-33390 being exploited in the wild.
How severe is CVE-2026-33390?
High severity, with a CVSS score of 8.1, published 9 July 2026.
Which products and versions are affected?
Nozomi Networks Guardian < 26.2.0.
Is there a fix for CVE-2026-33390?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-33390 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-33390?
Check whether you run Nozomi Networks Guardian at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An Incorrect Privilege Assignment (CWE-266) exists in the synchronization functionality of Nozomi Networks Guardian and CMC. The vulnerability stems from Arc sensors receiving excessive CLI permissions during the sync process. A network-based attacker with low-privileged credentials can leverage this flaw to push administrative CLI commands to the device. Successful exploitation allows the attacker to modify device configurations or impact system availability. The issue is resolved in version 26.2.0; users are advised to upgrade or review and disable untrusted sensors as a mitigation.

Affected products

  • Nozomi Networks Guardian < 26.2.0
  • Nozomi Networks CMC < 26.2.0

Timeline

  • 2026-07-07: advisory: Initial advisory released by Nozomi Networks
  • 2026-07-09: disclosed: CVE published to NVD

References

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