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Vulnerability record · CVE-2024-42655 · published 29 July 2025

CVE-2024-42655: Emqx nanomq improper access control vulnerability

Emqx · Nanomq

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.

8.8 CVSS 3.1 High EPSS 0.36% · top 72.8% CWE-284 · Improper access control
8.8CVSS 3.1 base score
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/nanomq/nanomq Product
https://github.com/nanomq/nanomq/issues/1782#issuecomment-2171025812 ExploitIssue TrackingPatch
https://github.com/songxpu/bug_report/blob/master/MQTT/NanoMQ/CVE-2024-42655.md ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2024-42655), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.