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    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 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.

    Published:Aug 27, 2025
    Last Modified:Apr 15, 2026
    EPS:Aug 27, 2025
    EPSS Score:0.00056
    CVSS Score:7.5

    Affected Products

    Vendor
    Isc
    Product
    Kea

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-476 NULL Pointer Dereference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2019-6474 (CVSS 5.7) — A missing check on incoming client requests can be exploited to cause a situation where the Kea server's lease…
    CVE-2019-6472 (CVSS 6.5) — A packet containing a malformed DUID can cause the Kea DHCPv6 server process (kea-dhcp6) to exit due to an ass…
    CVE-2018-5739 (CVSS 6.5) — An extension to hooks capabilities which debuted in Kea 1.4.0 introduced a memory leak for operators who are u…
    CVE-2015-8373 (CVSS 6.8) — The kea-dhcp4 and kea-dhcp6 servers 0.9.2 and 1.0.0-beta in ISC Kea, when certain debugging settings are used,…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High