What is CVE-2023-33379?

CVE-2023-33379 is a critical-severity vulnerability in Connectedio Er2000t-Vz-Cat1. CVSS score: 9.8/10. Published 2023-08-04.

How severe is CVE-2023-33379?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Connectedio Er2000t-Vz-Cat1

CVE-2023-33379

Connected IO v2.1.0 and prior has a misconfiguration in their MQTT broker used for management and device communication, which allows devices to connect to the broker and issue commands to other device, impersonating Connected IO management platform and sending commands to all of Connected IO's devices.

Published 2023-08-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (51.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

References

www.connectedio.com/products/routers (Product)
claroty.com/team82/disclosure-dashboard/cve-2023-33379 (Third Party Advisory)

Frequently asked questions

What is CVE-2023-33379?: CVE-2023-33379 is a critical-severity vulnerability in Connectedio Er2000t-Vz-Cat1. CVSS score: 9.8/10. Published 2023-08-04.
How severe is CVE-2023-33379?: Critical severity. CVSS v3 base score is 9.8 out of 10.