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[USN-7740-1] LibEtPan vulnerability

Posted on 08 September 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7740-1
September 08, 2025

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

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

LibEtPan could be made to crash if it received specially crafted network
traffic.

Software Description:
- libetpan: Mail Framework for C Language

Details:

It was discovered that LibEtPan incorrectly handled memory when parsing
IMAP STATUS responses. A remote attacker could possibly use this issue to
cause LibEtPan to crash, resulting in a denial of service.

Update instructions:

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

Ubuntu 22.04 LTS
libetpan20 1.9.4-3+deb11u1build0.22.04.1

Ubuntu 20.04 LTS
libetpan20 1.9.4-2ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libetpan20 1.8.0-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
libetpan17 1.6-1ubuntu0.1+esm1
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-7740-1
CVE-2022-4121

Package Information:
https://launchpad.net/ubuntu/+source/libetpan/1.9.4-3+deb11u1build0.22.04.1

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