{"action":"Upgrade zeromq3 to 4.3.3-1 or later.","affected":[{"fixed":"4.3.3-1","introduced":"0"}],"component":"zeromq3","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["4.3.3-1"],"id":"tcs_01M5NFB1FE02WC148E4H9TTQ42","modified_at":"2026-10-23T18:04:48.813382139Z","published_at":"2021-05-28T11:15:07.933Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-20236","https://security-tracker.debian.org/tracker/CVE-2021-20236"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-20236#Debian:13/zeromq3","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-20236"}],"summary":"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 th"}