USN-7759-1: Kea DHCP vulnerabilities

Publication date

21 September 2025

Overview

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


Packages

  • isc-kea - Standards-based DHCP server

Details

It was discovered that Kea DHCP did not correctly handle invalid hostnames.
A remote attacker could possibly use this issue to cause a denial of
service.

It was discovered that Kea DHCP did not correctly handle invalid hostnames.
A remote attacker could possibly use this issue to cause a denial of
service.

Update instructions

After a standard system update you may need to restart Kea DHCP server instances to make all the necessary changes.

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
18.04 bionic kea-admin –  1.1.0-1ubuntu0.1~esm1  
kea-common –  1.1.0-1ubuntu0.1~esm1  
kea-dhcp-ddns-server –  1.1.0-1ubuntu0.1~esm1  
kea-dhcp4-server –  1.1.0-1ubuntu0.1~esm1  
kea-dhcp6-server –  1.1.0-1ubuntu0.1~esm1  
16.04 xenial kea-admin –  1.0.0-1ubuntu0.1~esm1  
kea-common –  1.0.0-1ubuntu0.1~esm1  
kea-dhcp-ddns-server –  1.0.0-1ubuntu0.1~esm1  
kea-dhcp4-server –  1.0.0-1ubuntu0.1~esm1  
kea-dhcp6-server –  1.0.0-1ubuntu0.1~esm1  

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