CVE-2025-40779 (GCVE-0-2025-40779)
Vulnerability from cvelistv5 – Published: 2025-08-27 20:23 – Updated: 2025-11-04 21:10
VLAI?
Title
Kea crash upon interaction between specific client options and subnet selection
Summary
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.
Severity ?
7.5 (High)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
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|---|---|---|---|---|---|
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Impacted products
Credits
ISC would like to thank the following for bringing this vulnerability to our attention:
* Jochen M.
* Martin Dinev, Trading212
* Ashwani Kumar, Post Graduate Institute of Medical Education & Research, Chandigarh, India
* Bret Giddings, University of Essex
* Florian Ritterhoff, Munich University of Applied Sciences
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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