zeromq3 vulnerabilities

It was discovered that ZeroMQ incorrectly handled certain application
metadata. A remote attacker could use this issue to cause ZeroMQ to crash,
or possibly execute arbitrary code. (CVE-2019-13132)

It was discovered that ZeroMQ mishandled certain network traffic. An
unauthenticated attacker could use this vulnerability to cause a denial-of-
service and prevent legitimate clients from communicating with ZeroMQ.
(CVE-2020-15166)

It was discovered that ZeroMQ did not properly manage memory under certain
circumstances. If a user or automated system were tricked into connecting
to one or multiple compromised servers, a remote attacker could use this
issue to cause a denial of service. (CVE-2021-20234)

It was discovered that ZeroMQ incorrectly handled memory when processing
messages with arbitrarily large sizes under certain circumstances. A remote
unauthenticated attacker could use this issue to cause a ZeroMQ server to crash,
resulting in a denial of service, or possibly execute arbitrary code. This issue
only affected Ubuntu 18.04 ESM and Ubuntu 20.04 ESM. (CVE-2021-20235)

It was discovered that ZeroMQ did not properly manage memory under certain
circumstances. A remote unauthenticated attacker could use this issue to
cause a ZeroMQ server to crash, resulting in a denial of service. This issue
only affected Ubuntu 18.04 ESM and Ubuntu 20.04 ESM. (CVE-2021-20237)