CVE-2024-50948Network attack vector

Broker crash via unbounded persistent sessions

Published Dec 3, 2024 · Updated Apr 3, 2026

Denial of service in Mochi MQTT Server 2.6.3 allows remote attackers to exhaust memory and crash the broker through persistent MQTT sessions. The broker retains publish/subscribe session state without an effective aggregate resource bound as malicious long-lived sessions accumulate. Reachability requires an MQTT listener that accepts attacker-controlled sessions; successful abuse exhausts process memory and interrupts all broker service.

CVSS severity7.5
High
EPSS probability0.61%
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 Mochi MQTT Server 2.6.3 allows remote attackers to exhaust memory and crash the broker through persistent MQTT sessions. The broker retains publish/subscribe session state without an effective aggregate resource bound as malicious long-lived sessions accumulate. Reachability requires an MQTT listener that accepts attacker-controlled sessions; successful abuse exhausts process memory and interrupts all broker service.

The record

CVE
CVE-2024-50948
Published
Dec 3, 2024
Updated
Apr 3, 2026
Vendor
Mochi MQTT
Product
Mochi MQTT Server
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 2026Record 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=2.6.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mochi MQTT · Mochi MQTT Serverversion=2.6.3

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

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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