Vulnerabilites related to isc - kea
CVE-2019-6474 (GCVE-0-2019-6474)
Vulnerability from cvelistv5
Published
2019-10-16 17:22
Modified
2024-09-16 22:19
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Only Kea servers which use memfile storage for leases are affected by this vulnerability. An attacker can exploit the missing check to deliberately create a situation where the server will not restart properly should it stop for any reason.
Summary
A missing check on incoming client requests can be exploited to cause a situation where the Kea server's lease storage contains leases which are rejected as invalid when the server tries to load leases from storage on restart. If the number of such leases exceeds a hard-coded limit in the Kea code, a server trying to restart will conclude that there is a problem with its lease store and give up. Versions affected: 1.4.0 to 1.5.0, 1.6.0-beta1, and 1.6.0-beta2
References
| ▼ | URL | Tags |
|---|---|---|
| https://kb.isc.org/docs/cve-2019-6474 | x_refsource_CONFIRM |
Impacted products
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CVE-2025-32802 (GCVE-0-2025-32802)
Vulnerability from cvelistv5
Published
2025-05-28 17:08
Modified
2025-05-28 17:23
Severity ?
VLAI Severity ?
EPSS score ?
CWE
Summary
Kea configuration and API directives can be used to overwrite arbitrary files, subject to permissions granted to Kea. Many common configurations run Kea as root, leave the API entry points unsecured by default, and/or place the control sockets in insecure paths.
This issue affects Kea versions 2.4.0 through 2.4.1, 2.6.0 through 2.6.2, and 2.7.0 through 2.7.8.
References
| ▼ | URL | Tags |
|---|---|---|
| https://kb.isc.org/docs/cve-2025-32802 | vendor-advisory |
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CVE-2015-8373 (GCVE-0-2015-8373)
Vulnerability from cvelistv5
Published
2015-12-22 23:00
Modified
2024-08-06 08:13
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- n/a
Summary
The kea-dhcp4 and kea-dhcp6 servers 0.9.2 and 1.0.0-beta in ISC Kea, when certain debugging settings are used, allow remote attackers to cause a denial of service (daemon crash) via a malformed packet.
References
| ▼ | URL | Tags |
|---|---|---|
| https://kb.isc.org/article/AA-01318 | x_refsource_CONFIRM | |
| http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175337.html | vendor-advisory, x_refsource_FEDORA | |
| http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175218.html | vendor-advisory, x_refsource_FEDORA |
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CVE-2019-6473 (GCVE-0-2019-6473)
Vulnerability from cvelistv5
Published
2019-10-16 17:22
Modified
2024-09-16 22:30
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- An attacker who is able to deliberately exploit this vulnerability can cause the kea-dhcp4 server to stop executing, resulting in denial of service to clients. Only the DHCPv4 service is affected by this vulnerability.
Summary
An invalid hostname option can trigger an assertion failure in the Kea DHCPv4 server process (kea-dhcp4), causing the server process to exit. Versions affected: 1.4.0 to 1.5.0, 1.6.0-beta1, and 1.6.0-beta2.
References
| ▼ | URL | Tags |
|---|---|---|
| https://kb.isc.org/docs/cve-2019-6473 | x_refsource_CONFIRM |
Impacted products
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CVE-2025-32803 (GCVE-0-2025-32803)
Vulnerability from cvelistv5
Published
2025-05-28 17:08
Modified
2025-05-28 17:28
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-276 - Incorrect Default Permissions
Summary
In some cases, Kea log files or lease files may be world-readable.
This issue affects Kea versions 2.4.0 through 2.4.1, 2.6.0 through 2.6.2, and 2.7.0 through 2.7.8.
References
| ▼ | URL | Tags |
|---|---|---|
| https://kb.isc.org/docs/cve-2025-32803 | vendor-advisory |
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CVE-2025-40779 (GCVE-0-2025-40779)
Vulnerability from cvelistv5
Published
2025-08-27 20:23
Modified
2025-08-28 14:08
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-476 - NULL Pointer Dereference
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
| ▼ | URL | Tags |
|---|---|---|
| https://kb.isc.org/docs/cve-2025-40779 | vendor-advisory |
Impacted products
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CVE-2019-6472 (GCVE-0-2019-6472)
Vulnerability from cvelistv5
Published
2019-10-16 17:22
Modified
2024-09-17 03:58
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- An attacker who is able to send a request containing a malformed DUID to the server (either directly or via a relay) can cause the DHCPv6 server process to terminate, denying service to clients. Only the DHCPv6 service is affected by this vulnerability.
Summary
A packet containing a malformed DUID can cause the Kea DHCPv6 server process (kea-dhcp6) to exit due to an assertion failure. Versions affected: 1.4.0 to 1.5.0, 1.6.0-beta1, and 1.6.0-beta2.
References
| ▼ | URL | Tags |
|---|---|---|
| https://kb.isc.org/docs/cve-2019-6472 | x_refsource_CONFIRM |
Impacted products
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CVE-2018-5739 (GCVE-0-2018-5739)
Vulnerability from cvelistv5
Published
2019-01-16 20:00
Modified
2024-09-17 02:11
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- Only servers using hooks which make use of the callout handle store are affected. A Kea server which is using one or more hooks libraries that exhibit this problem will increase its memory use over time, with the rate of increase being proportional to the amount of DHCP traffic processed. Eventually, due to uncontrolled growth, the server will either exhaust all system memory or, if the administrator has set a per-process memory limit, will hit that limit, after which point further memory allocations will fail and the Kea server will crash. An attacker who is within the broadcast domain of the Kea server or in a network which is permitted to relay DHCP traffic to the Kea server can hasten the arrival of this outcome by deliberately sending a large volume of requests to the Kea server. Ability to deliberately trigger this vulnerability depends on the hooks libraries used and the hook points used for callouts. Our scoring for this vulnerability is based on the hook points used for hook libraries distributed by ISC and also based on the assumption that the Kea server does not accept arbitrary traffic from the internet (but is protected, e.g. by firewall, and only accepts DHCP traffic from the local broadcast domain and from nearby networks via authorized DHCP relay agents.) We cannot score every combination, but the risk could be higher to custom-developed hook libraries using other hook points or to servers which accept arbitrary DHCP traffic without restriction.
Summary
An extension to hooks capabilities which debuted in Kea 1.4.0 introduced a memory leak for operators who are using certain hooks library facilities. In order to support multiple requests simultaneously, Kea 1.4 added a callout handle store but unfortunately the initial implementation of this store does not properly free memory in every case. Hooks which make use of query4 or query6 parameters in their callouts can leak memory, resulting in the eventual exhaustion of available memory and subsequent failure of the server process. Affects Kea DHCP 1.4.0.
References
| ▼ | URL | Tags |
|---|---|---|
| https://kb.isc.org/docs/aa-01626 | x_refsource_CONFIRM |
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CVE-2025-32801 (GCVE-0-2025-32801)
Vulnerability from cvelistv5
Published
2025-05-28 17:03
Modified
2025-05-28 17:33
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-94 - Improper Control of Generation of Code ('Code Injection')
Summary
Kea configuration and API directives can be used to load a malicious hook library. Many common configurations run Kea as root, leave the API entry points unsecured by default, and/or place the control sockets in insecure paths.
This issue affects Kea versions 2.4.0 through 2.4.1, 2.6.0 through 2.6.2, and 2.7.0 through 2.7.8.
References
| ▼ | URL | Tags |
|---|---|---|
| https://kb.isc.org/docs/cve-2025-32801 | vendor-advisory |
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var-201910-0309
Vulnerability from variot
A missing check on incoming client requests can be exploited to cause a situation where the Kea server's lease storage contains leases which are rejected as invalid when the server tries to load leases from storage on restart. If the number of such leases exceeds a hard-coded limit in the Kea code, a server trying to restart will conclude that there is a problem with its lease store and give up. Versions affected: 1.4.0 to 1.5.0, 1.6.0-beta1, and 1.6.0-beta2. ISC (Internet Systems Consortium) Provided by Kea DHCP The server has a service disruption (DoS) Vulnerabilities exist. Kea DHCP The server contains several vulnerabilities: * DHCPv6 Malformed format when operating on server DUID With packets containing Kea DHCPv6 server process (kea-dhcp6) Ends - CVE-2019-6472 * DHCPv4 While operating on the server hostname Depending on options assertion failure Occurs, Kea DHCPv4 server process (kea-dhcp4) Ends - CVE-2019-6473 * As a storage location for lease information memfile Is specified, if invalid lease information is stored in the storage more than a certain number Kea Server cannot be restarted - CVE-2019-6474Service disruption by a third party who can access the network to which the product is connected (DoS) An attack may be carried out. ISC Kea DHCP is an open source DHCP (Dynamic Host Configuration Protocol) server from the American ISC Corporation.
An input validation error vulnerability exists in ISC Kea DHCP versions 1.4.0 to 1.5.0, 1.6.0-beta1, and 1.6.0-beta2. The vulnerability stems from a network system or product that did not properly validate the input data
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"data": "A missing check on incoming client requests can be exploited to cause a situation where the Kea server\u0027s lease storage contains leases which are rejected as invalid when the server tries to load leases from storage on restart. If the number of such leases exceeds a hard-coded limit in the Kea code, a server trying to restart will conclude that there is a problem with its lease store and give up. Versions affected: 1.4.0 to 1.5.0, 1.6.0-beta1, and 1.6.0-beta2. ISC (Internet Systems Consortium) Provided by Kea DHCP The server has a service disruption (DoS) Vulnerabilities exist. Kea DHCP The server contains several vulnerabilities: * DHCPv6 Malformed format when operating on server DUID With packets containing Kea DHCPv6 server process (kea-dhcp6) Ends - CVE-2019-6472 * DHCPv4 While operating on the server hostname Depending on options assertion failure Occurs, Kea DHCPv4 server process (kea-dhcp4) Ends - CVE-2019-6473 * As a storage location for lease information memfile Is specified, if invalid lease information is stored in the storage more than a certain number Kea Server cannot be restarted - CVE-2019-6474Service disruption by a third party who can access the network to which the product is connected (DoS) An attack may be carried out. ISC Kea DHCP is an open source DHCP (Dynamic Host Configuration Protocol) server from the American ISC Corporation. \n\r\n\r\nAn input validation error vulnerability exists in ISC Kea DHCP versions 1.4.0 to 1.5.0, 1.6.0-beta1, and 1.6.0-beta2. The vulnerability stems from a network system or product that did not properly validate the input data",
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Vulnerability from fkie_nvd
Published
2019-10-16 18:15
Modified
2024-11-21 04:46
Severity ?
6.5 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
A packet containing a malformed DUID can cause the Kea DHCPv6 server process (kea-dhcp6) to exit due to an assertion failure. Versions affected: 1.4.0 to 1.5.0, 1.6.0-beta1, and 1.6.0-beta2.
References
| ▼ | URL | Tags | |
|---|---|---|---|
| security-officer@isc.org | https://kb.isc.org/docs/cve-2019-6472 | Vendor Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://kb.isc.org/docs/cve-2019-6472 | Vendor Advisory |
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Vulnerability from fkie_nvd
Published
2019-01-16 20:29
Modified
2024-11-21 04:09
Severity ?
6.5 (Medium) - CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
An extension to hooks capabilities which debuted in Kea 1.4.0 introduced a memory leak for operators who are using certain hooks library facilities. In order to support multiple requests simultaneously, Kea 1.4 added a callout handle store but unfortunately the initial implementation of this store does not properly free memory in every case. Hooks which make use of query4 or query6 parameters in their callouts can leak memory, resulting in the eventual exhaustion of available memory and subsequent failure of the server process. Affects Kea DHCP 1.4.0.
References
| ▼ | URL | Tags | |
|---|---|---|---|
| security-officer@isc.org | https://kb.isc.org/docs/aa-01626 | Vendor Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://kb.isc.org/docs/aa-01626 | Vendor Advisory |
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Vulnerability from fkie_nvd
Published
2015-12-22 23:59
Modified
2025-04-12 10:46
Severity ?
Summary
The kea-dhcp4 and kea-dhcp6 servers 0.9.2 and 1.0.0-beta in ISC Kea, when certain debugging settings are used, allow remote attackers to cause a denial of service (daemon crash) via a malformed packet.
References
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Vulnerability from fkie_nvd
Published
2019-10-16 18:15
Modified
2024-11-21 04:46
Severity ?
5.7 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.5 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
A missing check on incoming client requests can be exploited to cause a situation where the Kea server's lease storage contains leases which are rejected as invalid when the server tries to load leases from storage on restart. If the number of such leases exceeds a hard-coded limit in the Kea code, a server trying to restart will conclude that there is a problem with its lease store and give up. Versions affected: 1.4.0 to 1.5.0, 1.6.0-beta1, and 1.6.0-beta2
References
| ▼ | URL | Tags | |
|---|---|---|---|
| security-officer@isc.org | https://kb.isc.org/docs/cve-2019-6474 | Vendor Advisory | |
| af854a3a-2127-422b-91ae-364da2661108 | https://kb.isc.org/docs/cve-2019-6474 | Vendor Advisory |
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