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CVE-2025-40779

Kea crash upon interaction between specific client options and subnet selection

High7.5EPSS 0.54%
Published
Updated
Reserved
Assigned by
isc

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.

Scores

CVSS scores of CVE-2025-40779, by who scored it
Scored byCVSSScoreVector
iscCNA (assigner)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVDNVD · Deferred3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.54% · top 54% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Weakness

Affected products

  • ISC · Kea

    • affected 2.7.1 – ≤ 2.7.9
    • affected 3.0.0
    • affected 3.1.0
    • unaffected 2.6.0 – ≤ 2.6.4

What to do

Solution: Upgrade to the patched release most closely related to your current version of Kea: 3.0.1 or 3.1.1.

Workaround: No workarounds known.

Exploitation: We are not aware of any active exploits.

References (2)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .