CVE-2025-62723: FlashMQ is a MQTT broker/server, designed for multi-CPU environments

Q: How do I fix CVE-2025-62723?

flashmq: upgrade to 1.23.2. Exact commands for each OS are on this page.

Q: Is CVE-2025-62723 being exploited?

CVE-2025-62723 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-62723 affect?

CVE-2025-62723 affects flashmq. Severity is medium (CVSS 4.3). 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 (event

Q: How urgent is CVE-2025-62723?

Priority 22/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADE

CVE-2025-62723 is a medium-severity flaw (CVSS 4.3) affecting flashmq. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 72%)
CISA exploited list	No
Weakness	CWE-772
Published	2025-10-24
Last modified	2026-10-08

Publisher (CNA): GitHub, Inc. · Vendor: flashmq

Last updated 2026-10-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-10-24 21:16 UTCPublished CVE record published
2026-10-08 11:10 UTCUpdated Record last modified

flashmq flashmq UPGRADE

Affected: < 1.23.2

Fixed in: 1.23.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy flashmq || rpm -q flashmq || flashmq --version

2. UPGRADE to 1.23.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade flashmq

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade flashmq

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-62723?

flashmq: upgrade to 1.23.2. Exact commands for each OS are on this page.

Is CVE-2025-62723 being exploited?

CVE-2025-62723 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-62723 affect?

CVE-2025-62723 affects flashmq. Severity is medium (CVSS 4.3). 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 (event

How urgent is CVE-2025-62723?

Priority 22/100. No elevated risk signals yet.

Related CVEs

CVE-2024-42645 HIGH 7.5 DOWNGRADE An issue in FlashMQ v1.14.0 allows attackers to cause an assertion failure via sending a crafted retain messag
CVE-2024-42644 HIGH 7.5 DOWNGRADE FlashMQ v1.14.0 was discovered to contain an assertion failure in the function PublishCopyFactory::getNewPubli

References

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