CVE-2021-20234

MEDIUM

libzmq < 4.3.3 - Memory Leak in Pipe Connection Handling

Title source: llm
STIX 2.1

Description

An uncontrolled resource consumption (memory leak) flaw was found in the ZeroMQ client in versions before 4.3.3 in src/pipe.cpp. This issue causes a client that connects to multiple malicious or compromised servers to crash. The highest threat from this vulnerability is to system availability.

References (2)

Core 2
Core References
Issue Tracking, Patch, Third Party Advisory x_refsource_misc
https://bugzilla.redhat.com/show_bug.cgi?id=1921972
Exploit, Patch, Third Party Advisory x_refsource_misc
https://github.com/zeromq/libzmq/security/advisories/GHSA-wfr2-29gj-5w87

Scores

CVSS v3 6.5
EPSS 0.0107
EPSS Percentile 60.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Details

CWE
CWE-400 CWE-401
Status published
Products (1)
zeromq/libzmq < 4.3.3
Published Apr 01, 2021
Tracked Since Feb 18, 2026