How severe is CVE-2023-33379?

CVE-2023-33379 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-33379 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-33379?

CVE-2023-33379 affects Connectedio Er2000t-vz-cat1 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-33379?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-33379 published?

CVE-2023-33379 was published on 2023-08-04 and last updated on 2026-06-17.

CVE-2023-33379

CVE-2023-33379 is a critical-severity vulnerability in Connectedio Er2000t-vz-cat1 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Connectedio Er2000t-vz-cat1 Firmware
Published: 2023-08-04
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2023-33379?: CVE-2023-33379 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-33379 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-33379?: CVE-2023-33379 affects Connectedio Er2000t-vz-cat1 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-33379?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-33379 published?: CVE-2023-33379 was published on 2023-08-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:connectedio:er2000t-vz-cat1_firmware:*:*:*:*:*:*:*:*