CVE-2025-40779
Kea DHCPv4 Assertion Failure 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.
INFO
Published Date :
Aug. 27, 2025, 9:15 p.m.
Last Modified :
Aug. 27, 2025, 9:15 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Kea to a non-vulnerable version.
- Ensure clients do not send unicast DHCPv4 requests to Kea.
- Verify the Kea configuration and subnet assignments.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-40779.
| URL | Resource |
|---|---|
| https://kb.isc.org/docs/cve-2025-40779 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-40779 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-40779
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-40779 vulnerability anywhere in the article.
-
CybersecurityNews
Kea DHCP Server Vulnerability Let Remote Attacker Crash With a Single Crafted Packet
A newly disclosed vulnerability in the widely used ISC Kea DHCP server poses a significant security risk to network infrastructure worldwide. The flaw, designated CVE-2025-40779, allows remote attacke ... Read more
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Daily CyberSecurity
A Single Packet Can Crash a DHCP Server: High-Severity Flaw CVE-2025-40779 Found in Kea
The Internet Systems Consortium (ISC) has released a security advisory addressing a high-severity vulnerability in its widely used Kea DHCP server. The flaw, tracked as CVE-2025-40779 with a CVSS scor ... Read more
The following table lists the changes that have been made to the
CVE-2025-40779 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by [email protected]
Aug. 27, 2025
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-476 Added Reference https://kb.isc.org/docs/cve-2025-40779