CVE-2024-35492Network attack vector

Unauthenticated crash via crafted MQTT packet

Published May 29, 2024 · Updated Feb 13, 2025

NULL pointer dereference in Cesanta Mongoose commit b316989 allows remote attackers to crash embedded applications via a crafted MQTT packet. The scpy function in src/fmt.c dereferences a NULL pointer while processing attacker-controlled MQTT data instead of rejecting the malformed input. Any application embedding the affected commit and exposing its MQTT handling to untrusted network traffic can be terminated, interrupting the service it provides.

CVSS severity7.5
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Cesanta Mongoose commit b316989 allows remote attackers to crash embedded applications via a crafted MQTT packet. The scpy function in src/fmt.c dereferences a NULL pointer while processing attacker-controlled MQTT data instead of rejecting the malformed input. Any application embedding the affected commit and exposing its MQTT handling to untrusted network traffic can be terminated, interrupting the service it provides.

The record

CVE
CVE-2024-35492
Published
May 29, 2024
Updated
Feb 13, 2025
Vendor
Cesanta
Product
Mongoose
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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?

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

  1. Affected versionversion=b316989

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cesanta · Mongooseversion=b316989

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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