VULNERABILITY INTELLIGENCE

CVE-2021-20236

CVSS score9.8 CRITICAL

EPSS probability1.87%

CISA KEVNot currently listed

Published2021-05-28

Last modified2026-06-17

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

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.

Weakness classification

secalert@redhat.com: CWE-120
nvd@nist.gov: CWE-787

Primary references

secalert@redhat.com — Issue Tracking, Third Party Advisory
secalert@redhat.com — Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Patch, Third Party Advisory