CVE-2021-20236: zeromq: Stack overflow on server running PUB/XPUB socket

Severity: Critical

CVSS Score: 9.8

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.