What’s Vulnerable › Vulnerabilities
CVE-2025-40779: Kea crash upon interaction between specific client options and subnet selection
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-08-27 · updated 2026-06-17
- Weakness: CWE-476
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.
Affected products
- ISC Kea: from 2.7.1 through 2.7.9; 3.0.0, 3.1.0
References
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