X.org X11 Server up to 21.1.10 DeviceFocusEvent/the XIQueryPointer heap-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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9.0$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in X.org X11 Server up to 21.1.10. Affected is the function DeviceFocusEvent/the XIQueryPointer. Such manipulation leads to heap-based overflow. This vulnerability is documented as CVE-2023-6816. The attack needs to be performed locally. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, has been found in X.org X11 Server up to 21.1.10 (Windowing System Software). Affected by this issue is the function DeviceFocusEvent/the XIQueryPointer. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is confidentiality, integrity, and availability. CVE summarizes:

A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the X.Org Server was only allocating space for the device's particular number of buttons, leading to a heap overflow if a bigger value was used.

The weakness was released 01/18/2024. The advisory is available at access.redhat.com. This vulnerability is handled as CVE-2023-6816 since 12/14/2023. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 208617 (CentOS 7 : tigervnc (RHSA-2024:0629)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 21.1.11 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (208617) and EUVD (EUVD-2023-59026). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.1
VulDB Meta Temp Score: 9.0

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CNA Base Score: 9.8
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

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

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 208617
Nessus Name: CentOS 7 : tigervnc (RHSA-2024:0629)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: X11 Server 21.1.11

Timelineinfo

12/14/2023 🔍
01/18/2024 +35 days 🔍
01/18/2024 +0 days 🔍
07/09/2025 +538 days 🔍

Sourcesinfo

Vendor: x.org

Advisory: RHSA-2024:0320
Status: Confirmed

CVE: CVE-2023-6816 (🔍)
GCVE (CVE): GCVE-0-2023-6816
GCVE (VulDB): GCVE-100-251426
EUVD: 🔍

Entryinfo

Created: 01/18/2024 06:57
Updated: 07/09/2025 13:09
Changes: 01/18/2024 06:57 (51), 02/12/2024 08:58 (1), 09/17/2024 00:34 (30), 10/13/2024 08:50 (2), 07/09/2025 13:09 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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