ISC Kea up to 3.1.2 out-of-range pointer offset

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability was found in ISC Kea up to 2.6.3/2.7.8/2.x/3.0.1/3.1.2. It has been declared as critical. This vulnerability affects unknown code. Such manipulation leads to use of out-of-range pointer offset. This vulnerability is documented as CVE-2025-11232. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in ISC Kea up to 2.6.3/2.7.8/2.x/3.0.1/3.1.2 and classified as critical. Affected by this issue is some unknown processing. The manipulation with an unknown input leads to a use of out-of-range pointer offset vulnerability. Using CWE to declare the problem leads to CWE-823. The product performs pointer arithmetic on a valid pointer, but it uses an offset that can point outside of the intended range of valid memory locations for the resulting pointer. Impacted is availability. CVE summarizes:

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.

The advisory is shared for download at kb.isc.org. This vulnerability is handled as CVE-2025-11232 since 10/01/2025. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 272041 (FreeBSD : ISC KEA -- Invalid characters cause assert (55c4e822-b4e4-11f0-8438-001b217e4ee5)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.6.4, 2.7.9, 3.0.0 or 3.1.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (272041). Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.7
VulDB Meta Temp Score: 6.6

VulDB Base Score: 5.9
VulDB Temp Score: 5.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (isc): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use of out-of-range pointer offset
CWE: CWE-823
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 272041
Nessus Name: FreeBSD : ISC KEA -- Invalid characters cause assert (55c4e822-b4e4-11f0-8438-001b217e4ee5)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kea 2.6.4/2.7.9/3.0.0/3.1.0

Timelineinfo

10/01/2025 CVE reserved
10/29/2025 +28 days Advisory disclosed
10/29/2025 +0 days VulDB entry created
11/01/2025 +3 days VulDB entry last update

Sourcesinfo

Vendor: isc.org

Advisory: kb.isc.org
Status: Confirmed

CVE: CVE-2025-11232 (🔒)
GCVE (CVE): GCVE-0-2025-11232
GCVE (VulDB): GCVE-100-330476

Entryinfo

Created: 10/29/2025 23:31
Updated: 11/01/2025 13:40
Changes: 10/29/2025 23:31 (62), 11/01/2025 13:40 (2)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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