Vulnerability-Lookup

ubuntu-cve-2025-40779 Withdrawn 2025-11-28

Vulnerability from osv_ubuntu

Published

2025-08-27 21:15

Modified

2025-10-24 05:23

Summary

Details

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.

Severity

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2025-40779	REPORT
	https://www.cve.org/CVERecord?id=CVE-2025-40779	REPORT
	https://kb.isc.org/docs/cve-2025-40779	REPORT
	https://gitlab.isc.org/isc-projects/kea/-/commit/…	REPORT
	https://gitlab.isc.org/isc-projects/kea/-/commit/…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "kea-admin",
            "binary_version": "1.0.0-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "kea-common",
            "binary_version": "1.0.0-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "kea-dev",
            "binary_version": "1.0.0-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "kea-dhcp-ddns-server",
            "binary_version": "1.0.0-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "kea-dhcp4-server",
            "binary_version": "1.0.0-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "kea-dhcp6-server",
            "binary_version": "1.0.0-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "isc-kea",
        "purl": "pkg:deb/ubuntu/isc-kea@1.0.0-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
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            }
          ],
          "type": "ECOSYSTEM"
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      ],
      "versions": [
        "1.0.0-1",
        "1.0.0-1build1",
        "1.0.0-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "kea-admin",
            "binary_version": "1.1.0-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "kea-common",
            "binary_version": "1.1.0-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "kea-dev",
            "binary_version": "1.1.0-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "kea-dhcp-ddns-server",
            "binary_version": "1.1.0-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "kea-dhcp4-server",
            "binary_version": "1.1.0-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "kea-dhcp6-server",
            "binary_version": "1.1.0-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "isc-kea",
        "purl": "pkg:deb/ubuntu/isc-kea@1.1.0-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.0-1",
        "1.1.0-1build1",
        "1.1.0-1build2",
        "1.1.0-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "kea-admin",
            "binary_version": "1.6.2-0ubuntu1"
          },
          {
            "binary_name": "kea-common",
            "binary_version": "1.6.2-0ubuntu1"
          },
          {
            "binary_name": "kea-ctrl-agent",
            "binary_version": "1.6.2-0ubuntu1"
          },
          {
            "binary_name": "kea-dev",
            "binary_version": "1.6.2-0ubuntu1"
          },
          {
            "binary_name": "kea-dhcp-ddns-server",
            "binary_version": "1.6.2-0ubuntu1"
          },
          {
            "binary_name": "kea-dhcp4-server",
            "binary_version": "1.6.2-0ubuntu1"
          },
          {
            "binary_name": "kea-dhcp6-server",
            "binary_version": "1.6.2-0ubuntu1"
          },
          {
            "binary_name": "python3-kea-connector",
            "binary_version": "1.6.2-0ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "isc-kea",
        "purl": "pkg:deb/ubuntu/isc-kea@1.6.2-0ubuntu1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.0-2ubuntu1",
        "1.5.0-2ubuntu2",
        "1.5.0-2ubuntu3",
        "1.6.1-0ubuntu1",
        "1.6.1-0ubuntu2",
        "1.6.2-0ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "kea",
            "binary_version": "2.0.2-1ubuntu0.1"
          },
          {
            "binary_name": "kea-admin",
            "binary_version": "2.0.2-1ubuntu0.1"
          },
          {
            "binary_name": "kea-common",
            "binary_version": "2.0.2-1ubuntu0.1"
          },
          {
            "binary_name": "kea-ctrl-agent",
            "binary_version": "2.0.2-1ubuntu0.1"
          },
          {
            "binary_name": "kea-dev",
            "binary_version": "2.0.2-1ubuntu0.1"
          },
          {
            "binary_name": "kea-dhcp-ddns-server",
            "binary_version": "2.0.2-1ubuntu0.1"
          },
          {
            "binary_name": "kea-dhcp4-server",
            "binary_version": "2.0.2-1ubuntu0.1"
          },
          {
            "binary_name": "kea-dhcp6-server",
            "binary_version": "2.0.2-1ubuntu0.1"
          },
          {
            "binary_name": "python3-kea-connector",
            "binary_version": "2.0.2-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "isc-kea",
        "purl": "pkg:deb/ubuntu/isc-kea@2.0.2-1ubuntu0.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.0-0ubuntu1",
        "2.0.1-2",
        "2.0.2-1",
        "2.0.2-1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "kea",
            "binary_version": "2.4.1-3ubuntu0.1"
          },
          {
            "binary_name": "kea-admin",
            "binary_version": "2.4.1-3ubuntu0.1"
          },
          {
            "binary_name": "kea-common",
            "binary_version": "2.4.1-3ubuntu0.1"
          },
          {
            "binary_name": "kea-ctrl-agent",
            "binary_version": "2.4.1-3ubuntu0.1"
          },
          {
            "binary_name": "kea-dev",
            "binary_version": "2.4.1-3ubuntu0.1"
          },
          {
            "binary_name": "kea-dhcp-ddns-server",
            "binary_version": "2.4.1-3ubuntu0.1"
          },
          {
            "binary_name": "kea-dhcp4-server",
            "binary_version": "2.4.1-3ubuntu0.1"
          },
          {
            "binary_name": "kea-dhcp6-server",
            "binary_version": "2.4.1-3ubuntu0.1"
          },
          {
            "binary_name": "python3-kea-connector",
            "binary_version": "2.4.1-3ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "isc-kea",
        "purl": "pkg:deb/ubuntu/isc-kea@2.4.1-3ubuntu0.1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.2.1-3",
        "2.4.0-1",
        "2.4.1-1",
        "2.4.1-2build1",
        "2.4.1-3build1",
        "2.4.1-3build3",
        "2.4.1-3build3.1",
        "2.4.1-3ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "kea",
            "binary_version": "2.6.3-2"
          },
          {
            "binary_name": "kea-admin",
            "binary_version": "2.6.3-2"
          },
          {
            "binary_name": "kea-common",
            "binary_version": "2.6.3-2"
          },
          {
            "binary_name": "kea-ctrl-agent",
            "binary_version": "2.6.3-2"
          },
          {
            "binary_name": "kea-dev",
            "binary_version": "2.6.3-2"
          },
          {
            "binary_name": "kea-dhcp-ddns-server",
            "binary_version": "2.6.3-2"
          },
          {
            "binary_name": "kea-dhcp4-server",
            "binary_version": "2.6.3-2"
          },
          {
            "binary_name": "kea-dhcp6-server",
            "binary_version": "2.6.3-2"
          },
          {
            "binary_name": "python3-kea-connector",
            "binary_version": "2.6.3-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "isc-kea",
        "purl": "pkg:deb/ubuntu/isc-kea@2.6.3-2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
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          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.6.1-1",
        "2.6.1-2",
        "2.6.3-1",
        "2.6.3-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "kea",
            "binary_version": "2.6.1-1ubuntu0.1"
          },
          {
            "binary_name": "kea-admin",
            "binary_version": "2.6.1-1ubuntu0.1"
          },
          {
            "binary_name": "kea-common",
            "binary_version": "2.6.1-1ubuntu0.1"
          },
          {
            "binary_name": "kea-ctrl-agent",
            "binary_version": "2.6.1-1ubuntu0.1"
          },
          {
            "binary_name": "kea-dev",
            "binary_version": "2.6.1-1ubuntu0.1"
          },
          {
            "binary_name": "kea-dhcp-ddns-server",
            "binary_version": "2.6.1-1ubuntu0.1"
          },
          {
            "binary_name": "kea-dhcp4-server",
            "binary_version": "2.6.1-1ubuntu0.1"
          },
          {
            "binary_name": "kea-dhcp6-server",
            "binary_version": "2.6.1-1ubuntu0.1"
          },
          {
            "binary_name": "python3-kea-connector",
            "binary_version": "2.6.1-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.04",
        "name": "isc-kea",
        "purl": "pkg:deb/ubuntu/isc-kea@2.6.1-1ubuntu0.1?arch=source\u0026distro=plucky"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.4.1-3build4",
        "2.6.1-1",
        "2.6.1-1ubuntu0.1"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2025-40779",
  "modified": "2025-10-24T05:23:31Z",
  "published": "2025-08-27T21:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-40779"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-40779"
    },
    {
      "type": "REPORT",
      "url": "https://kb.isc.org/docs/cve-2025-40779"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.isc.org/isc-projects/kea/-/commit/0afd42b5dfb2e547b3c25023953892c1e578aba3"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.isc.org/isc-projects/kea/-/commit/b25d7e8a81273e4099bf6c7f639ed774de2f3d08"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2025-40779"
  ],
  "withdrawn": "2025-11-28T05:19:59Z"
}

CVE-2025-40779 (GCVE-0-2025-40779)

Vulnerability from cvelistv5 – Published: 2025-08-27 20:23 – Updated: 2025-11-04 21:10

Title

Kea crash upon interaction between specific client options and subnet selection

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-08-28 14:07 UTC

CWE

CWE-476 - NULL Pointer Dereference

Assigner

isc mitre root

References

2 references

URL	Tags
https://kb.isc.org/docs/cve-2025-40779	vendor-advisory
http://www.openwall.com/lists/oss-security/2025/08/27/1

Impacted products

1 product

Vendor	Product	Version
ISC	Kea	Affected: 2.7.1 , ≤ 2.7.9 (custom) Affected: 3.0.0 Affected: 3.1.0 Unaffected: 2.6.0 , ≤ 2.6.4 (custom)

Date Public

2025-08-27 00:00

Credits

ISC would like to thank the following for bringing this vulnerability to our attention: * Jochen M. * Martin Dinev, Trading212 * Ashwani Kumar, Post Graduate Institute of Medical Education & Research, Chandigarh, India * Bret Giddings, University of Essex * Florian Ritterhoff, Munich University of Applied Sciences

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-40779",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-08-28T14:07:45.683079Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-08-28T14:08:05.935Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-04T21:10:15.428Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2025/08/27/1"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "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",
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            }
          ]
        }
      ],
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        {
          "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 \u0026 Research, Chandigarh, India\n* Bret Giddings, University of Essex\n* Florian Ritterhoff, Munich University of Applied Sciences"
        }
      ],
      "datePublic": "2025-08-27T00:00:00.000Z",
      "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."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "We are not aware of any active exploits."
        }
      ],
      "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."
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-476",
              "description": "CWE-476 NULL Pointer Dereference",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-27T20:23:29.489Z",
        "orgId": "404fd4d2-a609-4245-b543-2c944a302a22",
        "shortName": "isc"
      },
      "references": [
        {
          "name": "CVE-2025-40779",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://kb.isc.org/docs/cve-2025-40779"
        }
      ],
      "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."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Kea crash upon interaction between specific client options and subnet selection",
      "workarounds": [
        {
          "lang": "en",
          "value": "No workarounds known."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22",
    "assignerShortName": "isc",
    "cveId": "CVE-2025-40779",
    "datePublished": "2025-08-27T20:23:29.489Z",
    "dateReserved": "2025-04-16T08:44:49.857Z",
    "dateUpdated": "2025-11-04T21:10:15.428Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.