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USN-4124-1: Exim vulnerability

6 September 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


It was discovered that Exim incorrectly handled certain decoding
operations. A remote attacker could possibly use this issue to execute
arbitrary commands.

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.

Related notices

  • USN-4124-2: exim4-daemon-heavy, exim4-base, eximon4, exim4-daemon-custom, exim4-daemon-light, exim4-dev, exim4, exim4-config