CVE-2020-12398
If Thunderbird is configured to use STARTTLS for an IMAP server, and the server sends a PREAUTH response, then Thunderbird will continue with an unencrypted connection, causing …
Published: 2020-07-09 · CVSS: Unscored
If Thunderbird is configured to use STARTTLS for an IMAP server, and the server sends a PREAUTH response, then Thunderbird will continue with an unencrypted connection, causing email data to be sent without protection. This vulnerability affects Thunderbird < 68.9.0.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7