What is CVE-2023-33378?

CVE-2023-33378 is a critical-severity vulnerability in Connectedio Connected Io, classified under Argument Injection. CVSS score: 9.8/10. Published 2023-08-04.

How severe is CVE-2023-33378?

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

Vulnerability in Connectedio Connected Io

CVE-2023-33378

Connected IO v2.1.0 and prior has an argument injection vulnerability in its AT command message in its communication protocol, enabling attackers to execute arbitrary OS commands on 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: 0.008 (55.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Connectedio Connected Io

Weakness classification (CWE)

CWE-88 — Argument Injection

References

www.connectedio.com/products/routers (Product)
claroty.com/team82/disclosure-dashboard/cve-2023-33378 (Third Party Advisory)

Frequently asked questions

What is CVE-2023-33378?: CVE-2023-33378 is a critical-severity vulnerability in Connectedio Connected Io, classified under Argument Injection. CVSS score: 9.8/10. Published 2023-08-04.
How severe is CVE-2023-33378?: Critical severity. CVSS v3 base score is 9.8 out of 10.