CVE-2024-42650Public exploitNetwork attack vector

Broker crash via unchecked PUBLISH topic

Published Jul 15, 2025 · Updated Jul 15, 2025

Denial of service in NanoMQ 0.17.5 allows remote attackers to crash the MQTT broker with a crafted PUBLISH message. The handle_pub path accepts a zero-length or null topic and passes it into topic-alias storage and downstream topic handling without validation; the patch adds length and null checks. No authentication or user interaction is required, and successful exploitation terminates the broker process rather than exposing or modifying message data.

CVSS severity7.5
High
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in NanoMQ 0.17.5 allows remote attackers to crash the MQTT broker with a crafted PUBLISH message. The handle_pub path accepts a zero-length or null topic and passes it into topic-alias storage and downstream topic handling without validation; the patch adds length and null checks. No authentication or user interaction is required, and successful exploitation terminates the broker process rather than exposing or modifying message data.

The record

CVE
CVE-2024-42650
Published
Jul 15, 2025
Updated
Jul 15, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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