{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2025-40779", "assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22", "state": "PUBLISHED", "assignerShortName": "isc", "dateReserved": "2025-04-16T08:44:49.857Z", "datePublished": "2025-08-27T20:23:29.489Z", "dateUpdated": "2025-08-28T14:08:05.935Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "404fd4d2-a609-4245-b543-2c944a302a22", "shortName": "isc", "dateUpdated": "2025-08-27T20:23:29.489Z"}, "title": "Kea crash upon interaction between specific client options and subnet selection", "datePublic": "2025-08-27T00:00:00.000Z", "affected": [{"vendor": "ISC", "product": "Kea", "versions": [{"version": "2.7.1", "lessThanOrEqual": "2.7.9", "status": "affected", "versionType": "custom"}, {"version": "3.0.0", "status": "affected"}, {"version": "3.1.0", "status": "affected"}, {"version": "2.6.0", "lessThanOrEqual": "2.6.4", "status": "unaffected", "versionType": "custom"}], "defaultStatus": "unaffected"}], "metrics": [{"cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-476", "description": "CWE-476 NULL Pointer Dereference"}]}], "descriptions": [{"lang": "en", "value": "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.\nThis issue affects Kea versions 2.7.1 through 2.7.9, 3.0.0, and 3.1.0."}], "impacts": [{"descriptions": [{"lang": "en", "value": "Denial of service. A malicious or misconfigured DHCP client can crash the Kea DHCPv4 service by sending a single packet."}]}], "workarounds": [{"lang": "en", "value": "No workarounds known."}], "exploits": [{"lang": "en", "value": "We are not aware of any active exploits."}], "solutions": [{"lang": "en", "value": "Upgrade to the patched release most closely related to your current version of Kea: 3.0.1 or 3.1.1."}], "credits": [{"lang": "en", "value": "ISC would like to thank the following for bringing this vulnerability to our attention:\n\n* Jochen M.\n* Martin Dinev, Trading212\n* Ashwani Kumar, Post Graduate Institute of Medical Education & Research, Chandigarh, India\n* Bret Giddings, University of Essex\n* Florian Ritterhoff, Munich University of Applied Sciences"}], "references": [{"url": "https://kb.isc.org/docs/cve-2025-40779", "name": "CVE-2025-40779", "tags": ["vendor-advisory"]}], "source": {"discovery": "EXTERNAL"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2025-08-28T14:07:45.683079Z", "id": "CVE-2025-40779", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-08-28T14:08:05.935Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "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.\nThis issue affects Kea versions 2.7.1 through 2.7.9, 3.0.0, and 3.1.0."}, {"lang": "es", "value": "Si un cliente DHCPv4 env\u00eda una solicitud con opciones espec\u00edficas y Kea no encuentra una subred adecuada para el cliente, el proceso `kea-dhcp4` se cancelar\u00e1 con un error de aserci\u00f3n. Esto solo ocurre si la solicitud del cliente se env\u00eda por unidifusi\u00f3n directamente a Kea; los mensajes de difusi\u00f3n no causan el problema. Este problema afecta a las versiones de Kea 2.7.1 a 2.7.9, 3.0.0 y 3.1.0."}], "id": "CVE-2025-40779", "lastModified": "2025-08-29T16:24:09.860", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "[email protected]", "type": "Primary"}]}, "published": "2025-08-27T21:15:54.960", "references": [{"source": "[email protected]", "url": "https://kb.isc.org/docs/cve-2025-40779"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "[email protected]", "type": "Secondary"}]}

{"bugzilla": {"description": "kea: Kea crash upon interaction between specific client options and subnet selection", "id": "2391373", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2391373"}, "csaw": false, "cwe": "CWE-476", "details": ["No description is available for this CVE."], "name": "CVE-2025-40779", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Out of support scope", "package_name": "kea", "product_name": "Red Hat Enterprise Linux 10"}], "public_date": "2025-08-27T20:23:29Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40779\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40779\nhttps://kb.isc.org/docs/cve-2025-40779"], "threat_severity": "Important"}