CVE-2025-11232: ISC Kea

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

To trigger the issue, three configuration parameters must have specific settings: "hostname-char-set" must be left at the default setting, which is "[^A-Za-z0-9.-]"; "hostname-char-replacement" must be empty (the default); and "ddns-qualifying-suffix" must *NOT* be empty (the default is empty). DDNS updates do not need to be enabled for this issue to manifest. A client that sends certain option content would then cause kea-dhcp4 to exit unexpectedly. This issue affects Kea versions 3.0.1 through 3.0.1 and 3.1.1 through 3.1.2.

Affected products

• ISC Kea: from 3.0, up to and including 3.0.1; from 3.1.1, up to and including 3.1.2

Published 2025-10-29. Last modified 2026-10-08.