CVE-2025-11232Network attack vector

Unauthenticated DHCPv4 crash via hostname assertion

Published Oct 29, 2025 · Updated Oct 29, 2025

Denial of service in Internet Systems Consortium Kea DHCP 3.0.1 and 3.1.1 through 3.1.2 allows remote attackers to crash kea-dhcp4. The DHCPv4 hostname-processing path handles crafted client option content under the affected character-replacement settings and reaches an assertion instead of rejecting the value. Exploitation requires hostname-char-set to retain its default pattern, hostname-char-replacement to be empty, and ddns-qualifying-suffix to be nonempty; repeated packets interrupt DHCPv4 service.

CVSS severity7.5
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Internet Systems Consortium Kea DHCP 3.0.1 and 3.1.1 through 3.1.2 allows remote attackers to crash kea-dhcp4. The DHCPv4 hostname-processing path handles crafted client option content under the affected character-replacement settings and reaches an assertion instead of rejecting the value. Exploitation requires hostname-char-set to retain its default pattern, hostname-char-replacement to be empty, and ddns-qualifying-suffix to be nonempty; repeated packets interrupt DHCPv4 service.

The record

CVE
CVE-2025-11232
Published
Oct 29, 2025
Updated
Oct 29, 2025
Vendor
Internet Systems Consortium
Product
Kea DHCP
Classifications
CWE-823, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 29, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0.1 <=3.0.1
  2. Affected versionversion=3.1.1 <=3.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Internet Systems Consortium · Kea DHCPversion=3.0.1 <=3.0.1; version=3.1.1 <=3.1.2

Published CVSS scores

7.5Internet Systems ConsortiumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-823Use of Out-of-range Pointer Offset
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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