How severe is CVE-2024-42655?

CVE-2024-42655 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2024-42655 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-42655?

CVE-2024-42655 affects Emqx Nanomq. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-42655?

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-2024-42655 have an EU (EUVD) identifier?

Yes. CVE-2024-42655 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-54835.

When was CVE-2024-42655 published?

CVE-2024-42655 was published on 2025-07-29 and last updated on 2026-06-17.

CVE-2024-42655

CVE-2024-42655 is a high-severity vulnerability in Emqx Nanomq with a CVSS 3.x base score of 8.8. 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-284.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-54835
Weakness: CWE-284
Affected product: Emqx Nanomq
Published: 2025-07-29
Last modified: 2026-06-17

Description

An access control issue in NanoMQ v0.21.10 allows attackers to bypass security restrictions and access sensitive system topic messages using MQTT wildcard characters.

Frequently asked questions

What is CVE-2024-42655?: An access control issue in NanoMQ v0.21.10 allows attackers to bypass security restrictions and access sensitive system topic messages using MQTT wildcard characters.
How severe is CVE-2024-42655?: CVE-2024-42655 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2024-42655 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-42655?: CVE-2024-42655 affects Emqx Nanomq. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-42655?: 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-2024-42655 have an EU (EUVD) identifier?: Yes. CVE-2024-42655 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-54835.
When was CVE-2024-42655 published?: CVE-2024-42655 was published on 2025-07-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:emqx:nanomq:0.21.8:*:*:*:*:*:*:*

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