Reachable assertion in Kea - CVE-2025-40779
Published: September 2, 2025
Vulnerability identifier: #VU114676
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-40779
CWE-ID: CWE-617
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a reachable assertion when handling DHCP packets. A remote attacker can send 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. A remote attacker can perform a denial of service attack.
Affected software
Kea
Fedora
kea
Fedora
kea
How to mitigate CVE-2025-40779
Install updates from vendor's website.
Kea - addressed in versions 3.0.1, 3.1.1
kea - addressed in versions 3.0.1-1.fc42, 3.0.1-1.fc43, 3.0.1-1.fc44
kea - addressed in versions 3.0.1-1.fc42, 3.0.1-1.fc43, 3.0.1-1.fc44