CVE-2019-3814: Canonical Ubuntu Linux

Medium severity, CVSS 6.8. EPSS: 2.4% chance of exploitation in the next 30 days.

It was discovered that Dovecot before versions 2.2.36.1 and 2.3.4.1 incorrectly handled client certificates. A remote attacker in possession of a valid certificate with an empty username field could possibly use this issue to impersonate other users.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 16.04 only; version 18.04 only; version 18.10 only
• Dovecot Dovecot: from 1.1.0, before 2.2.36.1 (fixed in 2.2.36.1); from 2.3.0, before 2.3.4.1 (fixed in 2.3.4.1)
• Opensuse Leap: version 42.3 only

Published 2019-03-27. Last modified 2026-06-17.