How severe is CVE-2024-42651?

CVE-2024-42651 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2024-42651 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-42651?

CVE-2024-42651 affects Emqx Nanomq. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-42651?

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

Does CVE-2024-42651 have an EU (EUVD) identifier?

Yes. CVE-2024-42651 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-54836.

When was CVE-2024-42651 published?

CVE-2024-42651 was published on 2025-07-29 and last updated on 2026-06-17.

CVE-2024-42651

CVE-2024-42651 is a high-severity vulnerability in Emqx Nanomq with a CVSS 3.x base score of 7.5. 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-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-54836
Weakness: CWE-400
Affected product: Emqx Nanomq
Published: 2025-07-29
Last modified: 2026-06-17

Description

NanoMQ v0.17.9 was discovered to contain a heap use-after-free vulnerability via the component sub_Ctx_handle. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted SUBSCRIBE message.

Frequently asked questions

What is CVE-2024-42651?: NanoMQ v0.17.9 was discovered to contain a heap use-after-free vulnerability via the component sub_Ctx_handle. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted SUBSCRIBE message.
How severe is CVE-2024-42651?: CVE-2024-42651 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2024-42651 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-42651?: CVE-2024-42651 affects Emqx Nanomq. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-42651?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2024-42651 have an EU (EUVD) identifier?: Yes. CVE-2024-42651 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-54836.
When was CVE-2024-42651 published?: CVE-2024-42651 was published on 2025-07-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:emqx:nanomq:0.17.9:*:*:*:*:*:*:*

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