CVE-2021-38370

In Alpine before 2.25, untagged responses from an IMAP server are accepted before STARTTLS...

CVE-2020-14929

Alpine before 2.23 silently proceeds to use an insecure connection after a /tls is sent in certain circumstances involving PREAUTH, which is a less secure behavior than the alternative of closing the connection and letting the user decide what they would like to do...