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CVE-2025-40779

Kea crash upon interaction between specific client options and subnet selection

7.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.54%Up 0.5 points since Aug 28, 2025
90%50%10%1%

What each source reports

CVE List Score used 7.5

Kea crash upon interaction between specific client options and subnet selection

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.

Record
CVE-2025-40779
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-02
EUVDEUVD-2025-27981 7.5

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.

Record
EUVD-2025-27981
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-v32h-8f7r-3543 7.5

If a DHCPv4 client sends a request with some specific options, and Kea fails to find an...

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.

Record
GHSA-v32h-8f7r-3543
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-02
NVD 7.5

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.

Record
CVE-2025-40779
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-02
OSV 7.5

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.

Record
CVE-2025-40779
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2025:21006 7.5

Red Hat Security Advisory: kea security update

Record
RHSA-2025:21006
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2025-40779 7.5

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.

Record
UBUNTU-CVE-2025-40779
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2025:15499-1 No score

kea-3.0.1-1.1 on GA media

These are all security issues fixed in the kea-3.0.1-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2025:15499-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:20341-1 No score

Security update for kea

This update for kea fixes the following issues:

Update to release 3.0.1:

  • CVE-2025-40779: Fixed crash upon interaction between specific client options and subnet selection (bsc#1248801).
Record
openSUSE-SU-2026:20341-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
kea-debuginfo
Red Hat:enterprise_linux:10.1
 before 0:3.0.1-1.el10_1
0:3.0.1-1.el10_1
kea-debugsource
Red Hat:enterprise_linux:10.1
 before 0:3.0.1-1.el10_1
0:3.0.1-1.el10_1
kea-devel-debuginfo
Red Hat:enterprise_linux:10.1
 before 0:3.0.1-1.el10_1
0:3.0.1-1.el10_1
kea-doc
Red Hat:enterprise_linux:10.1
 before 0:3.0.1-1.el10_1
0:3.0.1-1.el10_1
kea-hooks
Red Hat:enterprise_linux:10.1
 before 0:3.0.1-1.el10_1
0:3.0.1-1.el10_1
kea-hooks-debuginfo
Red Hat:enterprise_linux:10.1
 before 0:3.0.1-1.el10_1
0:3.0.1-1.el10_1
kea-keama-debuginfo
Red Hat:enterprise_linux:10.1
 before 0:3.0.1-1.el10_1
0:3.0.1-1.el10_1
kea-libs-debuginfo
Red Hat:enterprise_linux:10.1
 before 0:3.0.1-1.el10_1
0:3.0.1-1.el10_1
kea
Red Hat:enterprise_linux:10.1
 before 0:3.0.1-1.el10_1
0:3.0.1-1.el10_1
kea-libs
Red Hat:enterprise_linux:10.1
 before 0:3.0.1-1.el10_1
0:3.0.1-1.el10_1
kea-keama
Red Hat:enterprise_linux:10.1
 before 0:3.0.1-1.el10_1
0:3.0.1-1.el10_1
kea
openSUSE:Tumbleweed
 before 3.0.1-1.1
3.0.1-1.1
kea
openSUSE:Leap 16.0
 before 3.0.1-160000.1.1
3.0.1-160000.1.1

History

History
RecordedChangedSources
affected
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-40779 is a high vulnerability (CVSS 7.5) in Isc Kea, published August 27, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.54%, the 45th percentile. Fixed in kea-debuginfo 0:3.0.1-1.el10_1.

References

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