Mutt before 1.14.4 and NeoMutt before 2020-06-19 have a STARTTLS buffering issue that affects IMAP, SMTP, and POP3. When a server sends a "begin TLS" response, the client reads additional data (e.g., from a man-in-the-middle attacker) and evaluates it in a TLS context, aka "response injection."
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "1.5.24-1ubuntu0.4", "binary_name": "mutt" }, { "binary_version": "1.5.24-1ubuntu0.4", "binary_name": "mutt-dbg" }, { "binary_version": "1.5.24-1ubuntu0.4", "binary_name": "mutt-dbgsym" }, { "binary_version": "1.5.24-1ubuntu0.4", "binary_name": "mutt-patched" }, { "binary_version": "1.5.24-1ubuntu0.4", "binary_name": "mutt-patched-dbgsym" } ] }