How severe is CVE-2025-59947?

CVE-2025-59947 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-59947 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-59947?

CVE-2025-59947 affects Emqx Nanomq. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-59947?

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.

Does CVE-2025-59947 have an EU (EUVD) identifier?

Yes. CVE-2025-59947 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203446.

When was CVE-2025-59947 published?

CVE-2025-59947 was published on 2025-12-15 and last updated on 2026-06-17.

CVE-2025-59947

CVE-2025-59947 is a critical-severity vulnerability in Emqx Nanomq with a CVSS 3.x base score of 9.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.0)
CVSS v4: 8.5
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-203446
Weakness: CWE-120
Affected product: Emqx Nanomq
Published: 2025-12-15
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-59947?: 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.
How severe is CVE-2025-59947?: CVE-2025-59947 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-59947 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-59947?: CVE-2025-59947 affects Emqx Nanomq. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-59947?: 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.
Does CVE-2025-59947 have an EU (EUVD) identifier?: Yes. CVE-2025-59947 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203446.
When was CVE-2025-59947 published?: CVE-2025-59947 was published on 2025-12-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:emqx:nanomq:*:*:*:*:*:*:*:*

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