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USN-5741-1: Exim vulnerability

24 November 2022

Exim could be made to crash or run programs if it processed specially crafted regular expressions.



  • exim4 - Exim is a mail transport agent


It was discovered that Exim incorrectly handled certain regular
expressions. An attacker could use this issue to cause Exim to crash,
resulting in a denial of service, or possibly execute arbitrary code.

Update instructions

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

Ubuntu 22.10
Ubuntu 22.04
Ubuntu 20.04
Ubuntu 18.04

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