CVE-2025-40779CWE-476

Kea crash upon interaction between specific client options and subnet selection

High · published August 27, 2025

CVSS v3.1
7.5
EPSS
1%
Percentile
44.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00539 · 44.6th percentile
Weakness
CWE-476 · NULL Pointer Dereference
Published
2025-08-27T20:23Z
EPSS history
Timeline
  • 27 AUG 20:23Z
    Kea crash upon interaction between specific client options and subnet selection
    cvelistv5