USN-4366-1: Exim vulnerability

19 May 2020

exim4 vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 20.04 LTS
  • Ubuntu 19.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 ESM


Exim could be made to access sensitive information or bypass authentication if it received a specially crafted input.

Software Description

  • exim4 - Exim is a mail transport agent


It was discovered that Exim incorrectly handled certain inputs. An remote attacker could possibly use this issue to access sensitive information or authentication bypass.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04 LTS
exim4-base - 4.93-13ubuntu1.1
exim4-daemon-heavy - 4.93-13ubuntu1.1
exim4-daemon-light - 4.93-13ubuntu1.1
Ubuntu 19.10
exim4-base - 4.92.1-1ubuntu3.1
exim4-daemon-heavy - 4.92.1-1ubuntu3.1
exim4-daemon-light - 4.92.1-1ubuntu3.1
Ubuntu 18.04 LTS
exim4-base - 4.90.1-1ubuntu1.5
exim4-daemon-heavy - 4.90.1-1ubuntu1.5
exim4-daemon-light - 4.90.1-1ubuntu1.5
Ubuntu 16.04 LTS
exim4-base - 4.86.2-2ubuntu2.6
exim4-daemon-heavy - 4.86.2-2ubuntu2.6
exim4-daemon-light - 4.86.2-2ubuntu2.6
Ubuntu 14.04 ESM
exim4-base - 4.82-3ubuntu2.4+esm2
exim4-daemon-heavy - 4.82-3ubuntu2.4+esm2
exim4-daemon-light - 4.82-3ubuntu2.4+esm2

To update your system, please follow these instructions:

In general, a standard system update will make all the necessary changes.