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CVE-2025-40779

Good to know:

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Date: August 27, 2025

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.

Severity Score

Related Resources (4)

https://nvd.nist.gov/vuln/detail/CVE-2025-40779
https://kb.isc.org/docs/cve-2025-40779
http://www.openwall.com/lists/oss-security/2025/08/27/1
https://www.mend.io/vulnerability-database/CVE-2025-40779

Severity Score

Weakness Type (CWE)

NULL Pointer Dereference

CWE-476

Top Fix

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Upgrade Version

Upgrade to version https://gitlab.isc.org/isc-projects/kea.git - Kea-3.0.1;https://gitlab.isc.org/isc-projects/kea.git - Kea-3.1.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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