VULNERABILITY INTELLIGENCE

CVE-2021-20237

CVSS score7.5 HIGH

EPSS probability1.69%

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:N/I:N/A:H

Description

An uncontrolled resource consumption (memory leak) flaw was found in ZeroMQ's src/xpub.cpp in versions before 4.3.3. This flaw allows a remote unauthenticated attacker to send crafted PUB messages that consume excessive memory if the CURVE/ZAP authentication is disabled on the server, causing a denial of service. The highest threat from this vulnerability is to system availability.

Weakness classification

secalert@redhat.com: CWE-400
nvd@nist.gov: CWE-401

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