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Severe, 6 weeks1496Projects326

1496 severe, 6 weeks · 326 projects

Nozomi NetworksCVE-2026-33389

Nozomi Networks Smart Polling functionality: attacker could access

Nozomi Networks

CVE-2026-33389 · Published Sep 8, 2026

Medium5.3
Fix: upgrade to Guardian 26.3.0 or later (3 fixed versions below)
Nozomi Networks advisory

An improper certificate/host key validation vulnerability was discovered in the Smart Polling functionality, which established encrypted connections to target devices without validating the remote host's identity, and no option was provided to enable it. A man-in-the-middle attacker positioned between a sensor and a polled device can, during a polling session, impersonate the device and intercept the communication, including the credentials used to access it. The captured credentials can then be replayed to authenticate against the device itself or against other devices sharing the same credentials, allowing the attacker to access and tamper with the device's data and to disrupt its operations.

Affected versions

PackageAffectedFixed in
Arc
Product
< 2.7.02.7.0
CMC
Product
< 26.3.026.3.0
Guardian
Product
< 26.3.026.3.0
Details and references
CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Severity from
the vendor (its own CVE record or advisory)
Weakness
CWE-671

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