What is CVE-2023-33377?

CVE-2023-33377 is a critical-severity vulnerability in Connectedio Connected Io, classified under OS Command Injection. CVSS score: 9.8/10. Published 2023-08-04.

How severe is CVE-2023-33377?

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

RCE in Connectedio Connected Io

CVE-2023-33377

Connected IO v2.1.0 and prior has an OS command injection vulnerability in the set firewall command in part of its communication protocol, enabling attackers to execute arbitrary OS commands on devices.

Vulnerability class: Command Injection (OS Command Injection)

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: 0.015 (73.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Connectedio Connected Io

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

www.connectedio.com/products/routers (Product)
claroty.com/team82/disclosure-dashboard/cve-2023-33377 (Third Party Advisory)

Frequently asked questions

What is CVE-2023-33377?: CVE-2023-33377 is a critical-severity vulnerability in Connectedio Connected Io, classified under OS Command Injection. CVSS score: 9.8/10. Published 2023-08-04.
How severe is CVE-2023-33377?: Critical severity. CVSS v3 base score is 9.8 out of 10.