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USN-4075-1: Exim vulnerability

25 July 2019

Exim could be made to run programs as an administrator if it received specially crafted network traffic.



  • exim4 - Exim is a mail transport agent


Jeremy Harris discovered that Exim incorrectly handled sort expansions. In
environments where sort expansions are used, a remote attacker could
possibly use this issue to execute arbitrary code as root.

Update instructions

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

Ubuntu 19.04
Ubuntu 18.04
Ubuntu 16.04

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