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CVE-2025-40779

Kea crash upon interaction between specific client options and subnet selection

Published: Aug 27, 2025Updated: Nov 4, 2025 Sources: CVE List NVD BDUCWE-476
7.5HIGH
NVD MITRE
EPSS Score
0.5%
Top 61.5%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
Patch Available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-476

Affected Products

РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
KeaInternet Systems Consortium
On-prem
Networking Infrastructure / dns-dhcp-ntp
KeaISCNetworking Infrastructure
ооо «ред софт»commercialRUOperating Systemsaka red soft
internet systems consortiumoss-projectUSNetworking Infrastructureaka isc
isccommercialUSNetworking Infrastructureaka internet systems consortium

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

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Official Patch Available
Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Impact
Initial Access
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References

https://kb.isc.org/docs/cve-2025-40779
kb.isc.org
http://www.openwall.com/lists/oss-security/2025/08/27/1
openwall.com
https://kb.isc.org/docs/cve-2025-40779
kb.isc.org
and 1 more references View all →

Timeline

Published
Aug 27, 2025
Last Updated
Nov 4, 2025

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