CVE-2025-40779— Kea crash upon interaction between specific client options and subnet selection
Quick assessment
Affected
ISC Kea
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
ISC Kea是ISC组织的一个现代开源 DHCPv4 和 DHCPv6 服务器。 ISC Kea 2.7.1至2.7.9版本和3.0.0、3.1.0版本存在安全漏洞，该漏洞源于DHCPv4客户端请求处理不当，可能导致进程中止。
Possible ATT&CK Techniques 2 AI
T1498 · Network Denial of Service T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-40779
Vulnerability Information
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Vulnerability Title
Kea crash upon interaction between specific client options and subnet selection
Source: CVE Program / CVE List V5
Vulnerability 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.
This issue affects Kea versions 2.7.1 through 2.7.9, 3.0.0, and 3.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
ISC Kea 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ISC Kea是ISC组织的一个现代开源 DHCPv4 和 DHCPv6 服务器。 ISC Kea 2.7.1至2.7.9版本和3.0.0、3.1.0版本存在安全漏洞，该漏洞源于DHCPv4客户端请求处理不当，可能导致进程中止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-40779
| # | POC Description | Source Link | Shenlong Link |
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