cyrus-imapd vulnerabilities

It was discovered that non-authentication-related HTTP requests could be
interpreted in an authentication context by a Cyrus IMAP Server when
multiple requests arrived over the same connection. An unauthenticated
attacker could possibly use this issue to perform a privilege escalation
attack. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-18928)

Matthew Horsfall discovered that Cyrus IMAP Server utilized a poor string
hashing algorithm that could be abused to control where data was being
stored. An attacker could possibly use this issue to perform a denial of
service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.
(CVE-2021-33582)

Damian Poddebniak discovered that Cyrus IMAP Server could interpret
specially crafted commands to exploit a memory issue. An authenticated
attacker could possibly use this issue to perform a denial of service.
This issue only affected Ubuntu 22.04 LTS and Ubuntu 24.04 LTS.
(CVE-2024-34055)