CVE-2021-34432 - Vulnerability Details - OpenCVE

Description

In Eclipse Mosquitto versions 2.0.7 and earlier, the server will crash if the client tries to send a PUBLISH packet with topic length = 0.

Published: 2021-07-27

Score: 7.5 High

EPSS: 1.2% Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

The Eclipse Foundation

Eclipse Mosquitto

unaffected

Version	Status	Constraints
`unspecified`	affected	≤ 2.0.7

Configuration 1 [-]

cpe:2.3:a:eclipse:mosquitto:*:*:*:*:*:*:*:*

No data.

No data available yet.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

Source	ID	Title
EUVD	EUVD-2021-21088	In Eclipse Mosquitto versions 2.07 and earlier, the server will crash if the client tries to send a PUBLISH packet with topic length = 0.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact None

Integrity Impact None

Availability Impact Partial

This CVE is not in the KEV list.

The EPSS score is 0.01247.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://bugs.eclipse.org/bugs/show_bug.cgi?id=574141

History

Thu, 02 Jul 2026 09:45:00 +0000

Type	Values Removed	Values Added
Description	In Eclipse Mosquitto versions 2.07 and earlier, the server will crash if the client tries to send a PUBLISH packet with topic length = 0.	In Eclipse Mosquitto versions 2.0.7 and earlier, the server will crash if the client tries to send a PUBLISH packet with topic length = 0.

Subscriptions

Eclipse Mosquitto

MITRE

Status: PUBLISHED

Assigner: eclipse

Published: 2021-07-27T15:25:17.000Z

Updated: 2026-07-02T09:31:38.182Z

Reserved: 2021-06-09T00:00:00.000Z

Link: CVE-2021-34432

Vulnrichment

No data.

NVD

Status : Modified

Published: 2021-07-27T16:15:07.893

Modified: 2026-06-17T03:55:51.427

Link: CVE-2021-34432

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

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