FKIE_CVE-2025-40779

Vulnerability from fkie_nvd - Published: 2025-08-27 21:15 - Updated: 2026-06-17 09:22
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
security-officer@isc.orghttps://kb.isc.org/docs/cve-2025-40779
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2025/08/27/1
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Kea",
          "vendor": "ISC",
          "versions": [
            {
              "lessThanOrEqual": "2.7.9",
              "status": "affected",
              "version": "2.7.1",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "3.0.0"
            },
            {
              "status": "affected",
              "version": "3.1.0"
            },
            {
              "lessThanOrEqual": "2.6.4",
              "status": "unaffected",
              "version": "2.6.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "security-officer@isc.org"
    }
  ],
  "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": "2026-06-17T09:22:07.557",
  "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": "security-officer@isc.org",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-40779",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-08-28T14:07:45.683079Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-08-27T21:15:54.960",
  "references": [
    {
      "source": "security-officer@isc.org",
      "url": "https://kb.isc.org/docs/cve-2025-40779"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2025/08/27/1"
    }
  ],
  "sourceIdentifier": "security-officer@isc.org",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "security-officer@isc.org",
      "type": "Secondary"
    }
  ]
}



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