What is CVE-2023-34494?

CVE-2023-34494 is a high-severity vulnerability in Emqx Nanomq, classified under Use After Free. CVSS score: 7.5/10. Published 2023-06-12.

How severe is CVE-2023-34494?

High severity. CVSS v3 base score is 7.5 out of 10.

Use After Free in Emqx Nanomq

CVE-2023-34494

NanoMQ 0.16.5 is vulnerable to heap-use-after-free in the nano_ctx_send function of nmq_mqtt.c.

Vulnerability class: Use-After-Free

Published 2023-06-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (50.2th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Emqx Nanomq — versions 0.16.5

Weakness classification (CWE)

CWE-416 — Use After Free

References

github.com/emqx/nanomq/issues/1180 (Patch, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2023-34494?: CVE-2023-34494 is a high-severity vulnerability in Emqx Nanomq, classified under Use After Free. CVSS score: 7.5/10. Published 2023-06-12.
How severe is CVE-2023-34494?: High severity. CVSS v3 base score is 7.5 out of 10.