Vulnerability in Emqx Nanomq
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (28.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Emqx Nanomq — versions 0.21.8
Weakness classification (CWE)
References
- github.com/nanomq/nanomq (Product)
- github.com/nanomq/nanomq/issues/1782 (Exploit, Patch, Issue Tracking)
- github.com/songxpu/bug_report/blob/master/MQTT/NanoMQ/CVE-2024-42655.md (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2024-42655?
- CVE-2024-42655 is a high-severity vulnerability in Emqx Nanomq, classified under Improper Access Control. CVSS score: 8.8/10. Published 2025-07-29.
- How severe is CVE-2024-42655?
- High severity. CVSS v3 base score is 8.8 out of 10.