CVE-2025-62723
FlashMQ does not release memory of queued QoS messages
Description
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.
INFO
Published Date :
Oct. 24, 2025, 9:16 p.m.
Last Modified :
Oct. 31, 2025, 7:31 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update FlashMQ to version 1.23.2.
- Restart the broker after updating.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-62723.
| URL | Resource |
|---|---|
| https://github.com/halfgaar/FlashMQ/commit/e86c49360ef4387440c97f591770cdb9284b4ee9 | Patch |
| https://github.com/halfgaar/FlashMQ/issues/154 | Issue Tracking |
| https://github.com/halfgaar/FlashMQ/security/advisories/GHSA-7mhp-22q4-r6vv | Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-62723 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-62723
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-62723 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-62723 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Oct. 31, 2025
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:flashmq:flashmq:*:*:*:*:*:*:*:* versions up to (excluding) 1.23.2 Added Reference Type GitHub, Inc.: https://github.com/halfgaar/FlashMQ/commit/e86c49360ef4387440c97f591770cdb9284b4ee9 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/halfgaar/FlashMQ/issues/154 Types: Issue Tracking Added Reference Type GitHub, Inc.: https://github.com/halfgaar/FlashMQ/security/advisories/GHSA-7mhp-22q4-r6vv Types: Patch, Vendor Advisory -
New CVE Received by [email protected]
Oct. 24, 2025
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L Added CWE CWE-772 Added Reference https://github.com/halfgaar/FlashMQ/commit/e86c49360ef4387440c97f591770cdb9284b4ee9 Added Reference https://github.com/halfgaar/FlashMQ/issues/154 Added Reference https://github.com/halfgaar/FlashMQ/security/advisories/GHSA-7mhp-22q4-r6vv