CVE-2020-14093: Canonical Ubuntu Linux

Medium severity, CVSS 5.9. EPSS: 2.1% chance of exploitation in the next 30 days.

Mutt before 1.14.3 allows an IMAP fcc/postpone man-in-the-middle attack via a PREAUTH response.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 16.04 only; version 18.04 only; version 19.10 only; version 20.04 only
• Debian Debian Linux: version 8.0 only; version 9.0 only; version 10.0 only
• Mutt Mutt: before 1.14.3 (fixed in 1.14.3)
• Opensuse Leap: version 15.1 only; version 15.2 only

Published 2020-06-15. Last modified 2026-06-17.