CVE-2025-40779 — Kea crash upon interaction between specific client options and subnet selection

CVE-2025-40779

Kea crash upon interaction between specific client options and subnet selection PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
ISC / Kea	affected 2.7.1 through 2.7.9; affected 3.0.0; affected 3.1.0; unaffected 2.6.0 through 2.6.4

CWE

CWE-476

References

https://kb.isc.org/docs/cve-2025-40779

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

CVE

No English description supplied.

http://www.openwall.com/lists/oss-security/2025/08/27/1