CVE-2021-20236

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

A flaw was found in the ZeroMQ server in versions before 4.3.3. This flaw allows a malicious client to cause a stack buffer overflow on the server by sending crafted topic subscription requests and then unsubscribing. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-120 CWE-787

Affected software

No affected versions have been published.

Timeline

Published: May 28, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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