CVE-2023-33379: Connected IO v2.1.0 and prior has a misconfiguration in their MQTT broker used for management and device commu

Q: How do I fix CVE-2023-33379?

er2000t-vz-cat1 firmware: upgrade to newer than 2.1.0. Exact commands for each OS are on this page.

Q: Is CVE-2023-33379 being exploited?

CVE-2023-33379 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-33379 affect?

CVE-2023-33379 affects er2000t-vz-cat1 firmware. Severity is critical (CVSS 9.8). 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

Q: How urgent is CVE-2023-33379?

Priority 52/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2023-33379 is a critical-severity flaw (CVSS 9.8) affecting er2000t-vz-cat1 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Published	2023-08-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: connectedio

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-08-04 18:15 UTCPublished CVE record published
2026-06-17 06:01 UTCUpdated Record last modified

connectedio er2000t-vz-cat1 firmware UPGRADE

Affected: <= 2.1.0

Fixed in: newer than 2.1.0

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-33379?

er2000t-vz-cat1 firmware: upgrade to newer than 2.1.0. Exact commands for each OS are on this page.

Is CVE-2023-33379 being exploited?

CVE-2023-33379 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-33379 affect?

CVE-2023-33379 affects er2000t-vz-cat1 firmware. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2023-33379?

Priority 52/100. Critical severity; Remotely exploitable, no login, no user action

References

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