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CVE-2025-62723— FlashMQ does not release memory of queued QoS messages

Quick assessment

Affected
halfgaar FlashMQ
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FlashMQ是Wiebe Cazemier个人开发者的一个快速轻量级的MQTT代理服务器。 FlashMQ 1.23.2之前版本存在安全漏洞，该漏洞源于认证用户可创建会话并收集QoS消息，可能导致资源未释放。

CVSS 4.3 · Medium EPSS 0.34% · P28

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-62723

Vulnerability Information
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Vulnerability Title
FlashMQ does not release memory of queued QoS messages
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对已超过有效生命周期的资源丧失索引
Source: CVE Program / CVE List V5
Vulnerability Title
FlashMQ 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FlashMQ是Wiebe Cazemier个人开发者的一个快速轻量级的MQTT代理服务器。 FlashMQ 1.23.2之前版本存在安全漏洞，该漏洞源于认证用户可创建会话并收集QoS消息，可能导致资源未释放。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
halfgaar FlashMQ < 1.23.2 -

II. Public POCs for CVE-2025-62723

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III. Intelligence Information for CVE-2025-62723

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IV. Related Vulnerabilities

Same product: FlashMQ
Same vendor: halfgaar
Same weakness: CWE-772