{"id":"CVE-2025-40779","state":"PUBLISHED","title":"Kea crash upon interaction between specific client options and subnet selection","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.\nThis issue affects Kea versions 2.7.1 through 2.7.9, 3.0.0, and 3.1.0.","publishedAt":"2025-08-27T20:23:29.489Z","updatedAt":"2025-11-04T21:10:15.428Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"isc"},"assigner":"isc","products":["ISC Kea"],"affected":[{"vendor":"ISC","product":"Kea","defaultStatus":"unaffected","versions":[{"version":"2.7.1","status":"affected","lessThanOrEqual":"2.7.9","versionType":"custom"},{"version":"3.0.0","status":"affected"},{"version":"3.1.0","status":"affected"},{"version":"2.6.0","status":"unaffected","lessThanOrEqual":"2.6.4","versionType":"custom"}]}],"references":["https://kb.isc.org/docs/cve-2025-40779","http://www.openwall.com/lists/oss-security/2025/08/27/1"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/40xxx/CVE-2025-40779.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40779","state":"PUBLISHED","datePublished":"2025-08-27T20:23:29.489Z","dateUpdated":"2025-11-04T21:10:15.428Z","assignerShortName":"isc","assignerOrgId":"404fd4d2-a609-4245-b543-2c944a302a22","dateReserved":"2025-04-16T08:44:49.857Z"},"containers":{"cna":{"title":"Kea crash upon interaction between specific client options and subnet selection","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."}],"affected":[{"vendor":"ISC","product":"Kea","defaultStatus":"unaffected","versions":[{"version":"2.7.1","status":"affected","lessThanOrEqual":"2.7.9","versionType":"custom"},{"version":"3.0.0","status":"affected"},{"version":"3.1.0","status":"affected"},{"version":"2.6.0","status":"unaffected","lessThanOrEqual":"2.6.4","versionType":"custom"}]}],"references":[{"url":"https://kb.isc.org/docs/cve-2025-40779","name":"CVE-2025-40779","tags":["vendor-advisory"]}],"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":[{"cweId":"CWE-476","lang":"en","type":"CWE","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"isc","orgId":"404fd4d2-a609-4245-b543-2c944a302a22","dateUpdated":"2025-08-27T20:23:29.489Z"},"datePublic":"2025-08-27T00:00:00.000Z","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"}],"source":{"discovery":"EXTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-08-28T14:08:05.935Z"}},{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2025/08/27/1"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-04T21:10:15.428Z"}}]}}}