What is CVE-2025-62723?

CVE-2025-62723 is a medium-severity vulnerability in Flashmq, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 4.3/10. Published 2025-10-24.

How severe is CVE-2025-62723?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Flashmq

CVE-2025-62723

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.23.2, any authenticated user can create sessions and have them collect QoS messages. When not sent to a client, these are then not released upon (eventual) session expiration. Version 1.23.2 fixes the issue.

Published 2025-10-24 · last modified 2026-10-08.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.003 (26.1th percentile), scored 2026-10-21.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Flashmq
Halfgaar Flashmq — versions < 1.23.2

Weakness classification (CWE)

CWE-772 — Missing Release of Resource after Effective Lifetime

References

github.com/halfgaar/FlashMQ/security/advisories/GHSA-7mhp-22q4-r6vv (Patch, Vendor Advisory)
github.com/halfgaar/FlashMQ/issues/154 (Issue Tracking)
github.com/halfgaar/FlashMQ/commit/e86c49360ef4387440c97f591770cdb9284b4ee9 (Patch)

Frequently asked questions

What is CVE-2025-62723?: CVE-2025-62723 is a medium-severity vulnerability in Flashmq, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 4.3/10. Published 2025-10-24.
How severe is CVE-2025-62723?: Medium severity. CVSS v3 base score is 4.3 out of 10.