{"id":"CVE-2021-20234","details":"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.","modified":"2026-04-11T23:13:56.303610Z","published":"2021-04-01T14:15:13.123Z","related":["GHSA-wfr2-29gj-5w87"],"references":[{"type":"FIX","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1921972"},{"type":"FIX","url":"https://github.com/zeromq/libzmq/security/advisories/GHSA-wfr2-29gj-5w87"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/zeromq/libzmq","events":[{"introduced":"0"},{"fixed":"04f5bbedee58c538934374dc45182d8fc5926fa3"}],"database_specific":{"source":"CPE_FIELD","cpe":"cpe:2.3:a:zeromq:libzmq:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"4.3.3"}]}}],"versions":["v3.1.0","v4.2.0","v4.2.0-rc1","v4.2.1","v4.2.2","v4.2.3","v4.2.4","v4.2.5","v4.3.0","v4.3.1","v4.3.2"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-20234.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}