CVE-2025-40779

HIGH EPSS 38.7%

Published Aug 27, 202510mo ago · Modified Jun 17, 20262w ago

7.5 CVSS 3.1

High

Published Aug 27, 2025 10mo ago

Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score

7.5

Exploitability

3.9

Impact

3.6

Vector string

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

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope Unchanged

Confidentiality None

Integrity None

Availability High

Threat Intelligence

EPSS Exploit Probability

38.7% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

References 2

openwall.com http://www.openwall.com/lists/oss-security/2025/08/27/1
kb.isc.org https://kb.isc.org/docs/cve-2025-40779

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.