A security downgrade issue has been found in Thunderbird before 68.9.0. 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.
A security downgrade issue has been found in Thunderbird before 68.9.0. 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.
https://www.mozilla.org/en-US/security/advisories/mfsa2020-22/#CVE-2020-12398 https://bugzilla.mozilla.org/show_bug.cgi?id=1613623
Vulmon