CVE-2024-8376Network attack vector

Broker crash via shared subscription tree aliasing

Published Oct 11, 2024 · Updated Oct 31, 2024

Memory corruption in Eclipse Mosquitto 2.0.18 allows remote authenticated users to crash the broker via crafted MQTT packet sequences. The broker stores shared and normal subscriptions in one topic tree, so a mismatched unsubscribe removes state from the wrong subscription kind and leaves later publish handling with freed state. MQTT access with low privileges is required; the sequence can grow memory, dereference freed heap state, or terminate the service with a segmentation fault.

CVSS severity7.2
High
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Eclipse Mosquitto 2.0.18 allows remote authenticated users to crash the broker via crafted MQTT packet sequences. The broker stores shared and normal subscriptions in one topic tree, so a mismatched unsubscribe removes state from the wrong subscription kind and leaves later publish handling with freed state. MQTT access with low privileges is required; the sequence can grow memory, dereference freed heap state, or terminate the service with a segmentation fault.

The record

CVE
CVE-2024-8376
Published
Oct 11, 2024
Updated
Oct 31, 2024
Vendor
The Eclipse Foundation
Product
Eclipse Mosquitto
Classifications
CWE-755, CWE-401, CWE-416, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 11, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 31, 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=2.0.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Eclipse Foundation · Eclipse Mosquittoversion=2.0.18

Published CVSS scores

7.2Eclipse FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:H/SC:N/SI:N/SA:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-755Improper Handling of Exceptional Conditions
CWE-401Missing Release of Memory after Effective Lifetime
CWE-416Use After Free
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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