Unexpected Exit Vulnerability in Kea DHCP Server from ISC
CVE-2025-11232

7.5HIGH

Key Information:

Vendor

Isc
Status
Kea
Vendor
CVE Published:
29 October 2025

Badges

👾 Exploit Exists

What is CVE-2025-11232?

The vulnerability allows for an unexpected exit of the Kea DHCP server when specific configuration parameters are set incorrectly. If the "hostname-char-set" uses the default value of "[^A-Za-z0-9.-]", the "hostname-char-replacement" is left empty, and the "ddns-qualifying-suffix" is set to a non-empty value, certain client requests can trigger this issue. Notably, DDNS updates do not need to be enabled for the vulnerability to present itself, impacting the stability of the server.

Affected Version(s)

Kea 3.0.1

Kea 3.1.1 <= 3.1.2

Kea 2.6.0

References

https://kb.isc.org/docs/cve-2025-11232
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ISC would like to thank Siniša Uskoković and Ralf Steuer from Vienna University of Economics and Business for bringing this vulnerability to our attention.
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