CVE-2025-40779

EUVD-2025-27981
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
iscCNA
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
isckea
2.7.1 ≤
𝑥
≤ 2.7.9
CNA
isckea
3.0.0
CNA
isckea
3.1.0
CNA
Debian logo
Debian Releases
Debian Product
Codename
isc-kea
bookworm
2.2.0-6
fixed
forky
3.0.3-1
fixed
sid
3.0.3-1
fixed
trixie
2.6.3-1
fixed
Common Weakness Enumeration
References
https://kb.isc.org/docs/cve-2025-40779
http://www.openwall.com/lists/oss-security/2025/08/27/1