Red Hat Security Advisory: kea security update
DHCP implementation from Internet Systems Consortium, Inc. that features fully functional DHCPv4, DHCPv6 and Dynamic DNS servers. Both DHCP servers fully support server discovery, address assignment, renewal, rebinding and release. The DHCPv6 server supports prefix delegation. Both servers support DNS Update mechanism, using stand-alone DDNS daemon. Security Fix(es): * kea: Kea crash upon interaction between specific client options and subnet selection (CVE-2025-40779) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
AI Analysis
Technical Summary
The Kea DHCP server from Internet Systems Consortium, Inc., which supports DHCPv4, DHCPv6, and Dynamic DNS, contains a vulnerability identified as CVE-2025-40779. This vulnerability causes the Kea server to crash upon interaction between certain client options and subnet selection logic. Red Hat has issued a security advisory (RHSA-2025:21006) for Red Hat Enterprise Linux 10 and related products, providing an update to fix this issue. The advisory classifies the impact as important and references the CVE for further details. No CVSS score is provided in the advisory.
Potential Impact
The vulnerability can cause the Kea DHCP server to crash, potentially leading to denial of service conditions for DHCP clients relying on the affected server. This may disrupt network address assignment and related DHCP services until the server is restarted or patched.
Mitigation Recommendations
Red Hat has released an update for Kea in Red Hat Enterprise Linux 10 to address this vulnerability. Users should apply the update as described in the Red Hat advisory RHSA-2025:21006 and the linked article https://access.redhat.com/articles/11258. Since an official fix is available, applying the update is the recommended remediation. No additional mitigation steps are indicated by the vendor.
Red Hat Security Advisory: kea security update
Description
DHCP implementation from Internet Systems Consortium, Inc. that features fully functional DHCPv4, DHCPv6 and Dynamic DNS servers. Both DHCP servers fully support server discovery, address assignment, renewal, rebinding and release. The DHCPv6 server supports prefix delegation. Both servers support DNS Update mechanism, using stand-alone DDNS daemon. Security Fix(es): * kea: Kea crash upon interaction between specific client options and subnet selection (CVE-2025-40779) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Kea DHCP server from Internet Systems Consortium, Inc., which supports DHCPv4, DHCPv6, and Dynamic DNS, contains a vulnerability identified as CVE-2025-40779. This vulnerability causes the Kea server to crash upon interaction between certain client options and subnet selection logic. Red Hat has issued a security advisory (RHSA-2025:21006) for Red Hat Enterprise Linux 10 and related products, providing an update to fix this issue. The advisory classifies the impact as important and references the CVE for further details. No CVSS score is provided in the advisory.
Potential Impact
The vulnerability can cause the Kea DHCP server to crash, potentially leading to denial of service conditions for DHCP clients relying on the affected server. This may disrupt network address assignment and related DHCP services until the server is restarted or patched.
Mitigation Recommendations
Red Hat has released an update for Kea in Red Hat Enterprise Linux 10 to address this vulnerability. Users should apply the update as described in the Red Hat advisory RHSA-2025:21006 and the linked article https://access.redhat.com/articles/11258. Since an official fix is available, applying the update is the recommended remediation. No additional mitigation steps are indicated by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2025:21006
- Cve Count
- 1
Threat ID: 6a3da1dd4853345fc182a224
Added to database: 06/25/2026, 21:47:09 UTC
Last enriched: 07/12/2026, 11:07:03 UTC
Last updated: 09/10/2026, 19:36:50 UTC
Views: 21
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