Signature Verification Flaw in Nozomi Networks Update Installation Process
CVE-2026-33923

7.5HIGH

Key Information:

Vendor

Nozomi Networks

Status
Guardian
Cmc
Vendor
CVE Published:
29 October 2026

What is CVE-2026-33923?

A signature verification flaw was identified in the update installation mechanism of Nozomi Networks appliances. This issue arises from inconsistent validation of update bundle contents. An attacker possessing administrative privileges can exploit this vulnerability by delivering a specially crafted update bundle that deceptively passes signature checks. When the affected update is executed, an unsigned script is triggered to run with elevated root privileges. This can lead to unauthorized access to sensitive information, alterations to device configurations, or even complete shutdown of the appliance, posing significant risks to the operational integrity of the network.

Affected Version(s)

CMC 0 < 26.4.0

Guardian 0 < 26.4.0

References

https://security.nozominetworks.com/NN-2026:21-01

CVSS V4

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was found by Andrea Palanca of Nozomi Networks Product Security team during an internal investigation.
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