What is CVE-2025-40779?

CVE-2025-40779 is a high-severity vulnerability in Isc Kea, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2025-08-27.

How severe is CVE-2025-40779?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in Isc Kea

CVE-2025-40779

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 di…

EPSS: 0.001 (25.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Isc Kea — versions 2.7.1, 3.0.0, 3.1.0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

CVE-2025-40779 (vendor-advisory)

Frequently asked questions

What is CVE-2025-40779?: CVE-2025-40779 is a high-severity vulnerability in Isc Kea, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2025-08-27.
How severe is CVE-2025-40779?: High severity. CVSS v3 base score is 7.5 out of 10.