Internet Systems Consortium Kea: Schwachstelle ermöglicht Denial of Service
WID-SEC-2026-0887 · first 27.03.2026 · updated 09.06.2026 · CVSS 7,5
What it is about
Internet Systems Consortium (ISC) Kea ist eine Open-Source-DHCP-Server-Implementierung. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Internet Systems Consortium Kea ausnutzen, um einen Denial of Service Angriff durchzuführen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- einen Denial of Service Angriff durchzuführen
Am I affected?
Affected according to the BSI:
- Red Hat Enterprise Linux
- Fedora Linux
- Ubuntu Linux
- SUSE Linux
- Oracle Linux
- SUSE openSUSE
- RESF Rocky Linux
- Internet Systems Consortium Kea <2.6.5
- Internet Systems Consortium Kea <3.0.3
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Internet Systems Consortium Kea 2.6.5
- Internet Systems Consortium Kea 3.0.3
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- ISC Security Advisory vom 2026-03-26 kb.isc.org
- openSUSE Security Update OPENSUSE-SU-2026:10421-1 vom 2026-03-28 lists.opensuse.org
- Fedora Security Advisory FEDORA-2026-11E168602C vom 2026-03-30 bodhi.fedoraproject.org
- Fedora Security Advisory FEDORA-2026-2B21A4DAFE vom 2026-03-30 bodhi.fedoraproject.org
- Fedora Security Advisory FEDORA-2026-66F19B11E0 vom 2026-03-30 bodhi.fedoraproject.org
- Fedora Security Advisory FEDORA-2026-04263E2A5B vom 2026-03-30 bodhi.fedoraproject.org
- Fedora Security Advisory FEDORA-EPEL-2026-01EA52D899 vom 2026-03-30 bodhi.fedoraproject.org
- openSUSE Security Update OPENSUSE-SU-2026:20452-1 vom 2026-04-02 lists.opensuse.org
- SUSE Security Update SUSE-SU-2026:20989-1 vom 2026-04-09 lists.suse.com
- Red Hat Security Advisory RHSA-2026:7342 vom 2026-04-09 access.redhat.com
- Rocky Linux Security Advisory RLSA-2026:7342 vom 2026-04-11 errata.build.resf.org
- Oracle Linux Security Advisory ELSA-2026-7342 vom 2026-04-11 linux.oracle.com
- SUSE Security Update SUSE-SU-2026:1378-1 vom 2026-04-16 lists.suse.com
- SUSE Security Update SUSE-SU-2026:1548-1 vom 2026-04-22 lists.suse.com
- Red Hat Security Advisory RHSA-2026:11344 vom 2026-04-28 access.redhat.com
- Ubuntu Security Notice USN-8403-1 vom 2026-06-08 ubuntu.com
CVE: CVE-2026-3608
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.