Ubuntu Security Notice USN-3951-1
April 23, 2019
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 19.04
– Ubuntu 18.10
Dovecot could be made to crash if it received specially crafted network
– dovecot: IMAP and POP3 email server
It was discovered that the Dovecot JSON encoder incorrectly handled certain
invalid UTF-8 characters. A remote attacker could possibly use this issue
to cause Dovecot to repeatedly crash, resulting in a denial of service.
The problem can be corrected by updating your system to the following
In general, a standard system update will make all the necessary changes.