CVE-2023-33372

Name: CVE-2023-33372
Creator: NVD / NIST
Published: 2023-08-04T18:15:11.883+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.76%

Last modified Jun 17, 2026

CVE-2023-33372 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Connected IO v2.1.0 and prior uses a hard-coded username/password pair embedded in their device's firmware used for device communication using MQTT. An attacker who gained access to these credentials is able to connect to the MQTT broker and send messages on behalf of devices, impersonating them. EPSS estimates a 0.76% chance of exploitation in the next 30 days.

Description

Connected IO v2.1.0 and prior uses a hard-coded username/password pair embedded in their device's firmware used for device communication using MQTT. An attacker who gained access to these credentials is able to connect to the MQTT broker and send messages on behalf of devices, impersonating them. in order to sign and verify JWT session tokens, allowing attackers to sign arbitrary session tokens and bypass authentication.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.76%

50.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-798

Affected Software

Vendor	Product	Versions
Connectedio	Connected Io	<= 2.1.0

References

https://claroty.com/team82/disclosure-dashboard/cve-2023-33372Third Party Advisory
https://www.connectedio.com/products/routersProduct
https://claroty.com/team82/disclosure-dashboard/cve-2023-33372Third Party Advisory
https://www.connectedio.com/products/routersProduct

Timeline

Published: Aug 4, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-33372?

How severe is CVE-2023-33372?

CVE-2023-33372 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.76% probability of exploitation in the next 30 days.

How do I fix CVE-2023-33372?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-33372?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST