Invalid characters cause assert
Summary
| CVE | CVE-2025-11232 |
|---|---|
| State | PUBLISHED |
| Assigner | isc |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2025-10-29 18:15:40 UTC |
| Updated | 2026-10-08 11:10:00 UTC |
| Description | To trigger the issue, three configuration parameters must have specific settings: "hostname-char-set" must be left at the default setting, which is "[^A-Za-z0-9.-]"; "hostname-char-replacement" must be empty (the default); and "ddns-qualifying-suffix" must *NOT* be empty (the default is empty). DDNS updates do not need to be enabled for this issue to manifest. A client that sends certain option content would then cause kea-dhcp4 to exit unexpectedly. This issue affects Kea versions 3.0.1 through 3.0.1 and 3.1.1 through 3.1.2. |
Risk And Classification
Primary CVSS: v3.1 7.5 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.004240000 probability, percentile 0.347000000 (date 2026-10-08)
Problem Types: CWE-823 | CWE-823 CWE-823 Use of Out-of-range Pointer Offset
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | CNA | DECLARED | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | ISC | Kea | affected 3.0.1 3.0.1 custom | Not specified |
| CNA | ISC | Kea | affected 3.1.1 3.1.2 custom | Not specified |
| CNA | ISC | Kea | unaffected 2.6.0 2.6.4 custom | Not specified |
| CNA | ISC | Kea | unaffected 2.7.0 2.7.9 custom | Not specified |
| CNA | ISC | Kea | unaffected 3.0.0 3.0.0 custom | Not specified |
| CNA | ISC | Kea | unaffected 3.1.0 3.1.0 custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| kb.isc.org/docs/cve-2025-11232 | [email protected] | kb.isc.org | |
| www.openwall.com/lists/oss-security/2025/10/29/5 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: ISC would like to thank Siniša Uskoković and Ralf Steuer from Vienna University of Economics and Business for bringing this vulnerability to our attention. (en)
Additional Advisory Data
Solutions
CNA: Upgrade to the patched release most closely related to your current version of Kea: 3.0.2 or 3.1.3.
Workarounds
CNA: Setting "hostname-char-replacement" to anything other than an empty value (suggestion: "x") is an effective workaround to this issue, regardless of other settings.
Exploits
CNA: We are not aware of any active exploits.