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CVE-2025-40779

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CVE-2025-40779

Published: Aug 27, 2025

Modified: Nov 4, 2025

PUBLISHED

CVSS v3.1

7.5

HIGH

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.

VendorProductVersions

ISC

Kea

affected
2.7.1 - <= 2.7.9
affected
3.0.0
affected
3.1.0
unaffected
2.6.0 - <= 2.6.4

Weaknesses (CWE)

CWE-476

CVSS v3.1 Details

CVSS v3.1 Vector

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

References

CVE-2025-40779
vendor-advisory

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