Advisory Published

USN-6611-1: Exim vulnerability

First published: Mon Jan 29 2024(Updated: )

It was discovered that Exim incorrectly handled certain requests. A remote attacker could possibly use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/exim4<4.96-17ubuntu2.2
4.96-17ubuntu2.2
Ubuntu=23.10
All of
ubuntu/exim4-base<4.96-17ubuntu2.2
4.96-17ubuntu2.2
Ubuntu=23.10
All of
ubuntu/eximon4<4.96-17ubuntu2.2
4.96-17ubuntu2.2
Ubuntu=23.10
All of
ubuntu/exim4<4.95-4ubuntu2.5
4.95-4ubuntu2.5
Ubuntu=22.04
All of
ubuntu/exim4-base<4.95-4ubuntu2.5
4.95-4ubuntu2.5
Ubuntu=22.04
All of
ubuntu/eximon4<4.95-4ubuntu2.5
4.95-4ubuntu2.5
Ubuntu=22.04
All of
ubuntu/exim4<4.93-13ubuntu1.10
4.93-13ubuntu1.10
Ubuntu=20.04
All of
ubuntu/exim4-base<4.93-13ubuntu1.10
4.93-13ubuntu1.10
Ubuntu=20.04
All of
ubuntu/eximon4<4.93-13ubuntu1.10
4.93-13ubuntu1.10
Ubuntu=20.04
All of
ubuntu/exim4<4.90.1-1ubuntu1.10+esm3
4.90.1-1ubuntu1.10+esm3
Ubuntu=18.04
All of
ubuntu/exim4-base<4.90.1-1ubuntu1.10+esm3
4.90.1-1ubuntu1.10+esm3
Ubuntu=18.04
All of
ubuntu/eximon4<4.90.1-1ubuntu1.10+esm3
4.90.1-1ubuntu1.10+esm3
Ubuntu=18.04
All of
ubuntu/exim4<4.86.2-2ubuntu2.6+esm6
4.86.2-2ubuntu2.6+esm6
Ubuntu=16.04
All of
ubuntu/exim4-base<4.86.2-2ubuntu2.6+esm6
4.86.2-2ubuntu2.6+esm6
Ubuntu=16.04
All of
ubuntu/eximon4<4.86.2-2ubuntu2.6+esm6
4.86.2-2ubuntu2.6+esm6
Ubuntu=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-6611-1?

    The severity of USN-6611-1 is considered high due to the potential for remote email spoofing that could bypass SPF protections.

  • How do I fix USN-6611-1?

    To fix USN-6611-1, upgrade Exim to version 4.96-17ubuntu2.2 for Ubuntu 23.10 or the respective fixed versions for earlier releases.

  • What products are affected by USN-6611-1?

    Affected products include Exim4, Exim4-base, and Eximon4 on various versions of Ubuntu such as 16.04, 18.04, 20.04, 22.04, and 23.10.

  • Can I be attacked if I don't update for USN-6611-1?

    Yes, if you do not update, your system remains vulnerable to remote attackers exploiting email spoofing techniques associated with USN-6611-1.

  • What type of vulnerability is described in USN-6611-1?

    USN-6611-1 describes a vulnerability related to improper request handling in Exim that allows the injection of spoofed email messages.

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