CVE-2025-40779

Published: Aug 27, 2025Modified: Jun 17, 2026Deferred

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability: 3.9 / Impact: 3.6

Source: security-officer@isc.org (Secondary)

Description

If a DHCPv4 client sends a request with some specific options, and Kea fails to find an appropriate subnet for the client, the `kea-dhcp4` process will abort with an assertion failure. This happens only if the client request is unicast directly to Kea; broadcast messages do not cause the problem. This issue affects Kea versions 2.7.1 through 2.7.9, 3.0.0, and 3.1.0.

Related CWEs

CWE-476

NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

References (2)

https://kb.isc.org/docs/cve-2025-40779

Source: security-officer@isc.org

http://www.openwall.com/lists/oss-security/2025/08/27/1

Source: af854a3a-2127-422b-91ae-364da2661108

Timeline

No history available yet.