CVE-2024-3935Public exploitNetwork attack vector

Broker crash via dangling remapped-topic pointer

Published Oct 30, 2024 · Updated Nov 3, 2025

Double free in Eclipse Mosquitto 2.0.0 through 2.0.18 allows remote attackers to crash the broker with a crafted PUBLISH packet. bridge__remap_topic_in frees the topic after a remapping error but leaves the caller-visible pointer non-null, causing a later cleanup path to free the same allocation again. Exploitation requires an outgoing bridge whose incoming topic uses remapping and control of the remote bridge connection; the reported consequence is a broker crash.

CVSS severity6.5
Medium
EPSS probability0.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Double free in Eclipse Mosquitto 2.0.0 through 2.0.18 allows remote attackers to crash the broker with a crafted PUBLISH packet. bridge__remap_topic_in frees the topic after a remapping error but leaves the caller-visible pointer non-null, causing a later cleanup path to free the same allocation again. Exploitation requires an outgoing bridge whose incoming topic uses remapping and control of the remote bridge connection; the reported consequence is a broker crash.

The record

CVE
CVE-2024-3935
Published
Oct 30, 2024
Updated
Nov 3, 2025
Vendor
The Eclipse Foundation
Product
Eclipse Mosquitto
Classifications
CWE-415, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 30, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=2.0.0 <=2.0.18
  2. Affected versionversion=2.0.0 <2.0.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Eclipse Foundation · Eclipse Mosquittoversion=2.0.0 <=2.0.18; version=2.0.0 <2.0.18

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.0Eclipse FoundationCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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 exploitPublished

Weakness, pattern, technique

CWE-415Double Free
T1499Endpoint Denial of Service

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo