CVE-2024-31036Public exploitNetwork attack vector

Broker crash via unchecked MQTT property read

Published Apr 22, 2024 · Updated Aug 2, 2024

Heap-buffer overflow in NanoMQ 0.21.7 allows remote authenticated users to crash the broker through crafted MQTT packets. During PUBLISH property decoding, mqtt_codec.c read_byte increments curpos and dereferences it without checking the 387-byte buffer boundary. CISA assesses exploitation as requiring low privileges and user interaction; the demonstrated packet sequence aborts the broker process.

CVSS severity6.8
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-buffer overflow in NanoMQ 0.21.7 allows remote authenticated users to crash the broker through crafted MQTT packets. During PUBLISH property decoding, mqtt_codec.c read_byte increments curpos and dereferences it without checking the 387-byte buffer boundary. CISA assesses exploitation as requiring low privileges and user interaction; the demonstrated packet sequence aborts the broker process.

The record

CVE
CVE-2024-31036
Published
Apr 22, 2024
Updated
Aug 2, 2024
Vendor
EMQ Technologies
Product
NanoMQ
Classifications
CWE-122, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.21.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

EMQ Technologies · NanoMQversion=0.21.7

Published CVSS scores

6.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
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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