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CVE-2025-59947

Emqx Nanomq buffer overflow

9.0 CRITICALEPSS 0.33%
  1. Published15 Dec 2025

Description

NanoMQ is a messaging broker/bus for IoT Edge & SDV. Versions prior to 0.24.4 have a buffer overflow case while the PUBLISH packets trigger both shared subscription and vanila subscription. This is fixed in version 0.24.4. As a workaround, disable shared subscription.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Affected products

Emqx Nanomq< 0.24.4

Remediation

Fixed in
Emqx Nanomq≥ 0.24.4

References

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Frequently asked

Is CVE-2025-59947 being actively exploited?

CVE-2025-59947 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.33%.

How severe is CVE-2025-59947?

CVE-2025-59947 has a CVSS 3.1 base score of 9.0, rated critical. EPSS estimates a 0.33% probability of exploitation.

Which products are affected by CVE-2025-59947?

Affected products include Emqx Nanomq.

How do I fix CVE-2025-59947?

Upgrade affected software to a fixed version, for example Emqx Nanomq 0.24.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-59947 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.