Headline
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.
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CVE-2021-39272: NO STARTTLS
Fetchmail before 6.4.22 fails to enforce STARTTLS session encryption in some circumstances, such as a certain situation with IMAP and PREAUTH.
CVE-2021-38370: NO STARTTLS
In Alpine before 2.25, untagged responses from an IMAP server are accepted before STARTTLS.