Is CVE-2023-6816 actively exploited?

CVE-2023-6816 has no public evidence of in-the-wild exploitation as of 2025-08-29.

What is the CVSS score for CVE-2023-6816?

CVE-2023-6816 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2023-6816?

Patch guidance is available from x.org security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2023-6816.

Fix CVE-2023-6816 - CRITICAL x.org x server

Q: Which products are affected by CVE-2023-6816?

7 products: x.org x server, x.org xwayland, fedoraproject fedora, redhat enterprise linux desktop, redhat enterprise linux server, and 2 more.

Description

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-787 · Out-of-bounds Write CWE-787 · Out-of-bounds Write

Metadata

Primary Vendor: X.ORG
Published: 1/18/2024
Last Modified: 8/29/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

x.org : x_serverx.org : xwaylandfedoraproject : fedoraredhat : enterprise_linux_desktopredhat : enterprise_linux_serverredhat : enterprise_linux_workstationdebian : debian_linux

Remediation Guidance

Executive Summary

View on NIST NVD