CVE-2026-33389Disabled and non-configurable certificate/host key validation in Smart Polling in Guardian/CMC before 26.3.0 and Arc before v2.7.0
Updated under an hour ago ()
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It affects Nozomi Networks Guardian and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:L
- Weakness (CWE)
- CWE-671
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Nozomi
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Nozomi Networks Guardian nozomi_networks:guardian (from the name) | before 26.3.0 | CNA record |
Nozomi Networks CMC nozomi_networks:cmc (from the name) | before 26.3.0 | CNA record |
Nozomi Networks Arc nozomi_networks:arc (from the name) | before 2.7.0 | CNA record |
Siemens RUGGEDCOM APE1808 siemens:ruggedcom_ape1808 (from the name) | all versions | CISA ADP |
References
- https://security.nozominetworks.com/NN-2026:20-01
- https://cert-portal.siemens.com/productcert/html/ssa-911336.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.