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.
Conclusion & alert: CVE-2023-6816 is rated High Risk (66/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.11%). Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 3.02% | 2.11% | -0.91% |
| 2 | 2026-04-19 | 3.26% | 3.02% | -0.25% |
| 3 | 2026-02-05 | — | 3.26% | — |
Full EPSS history (32 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.8 | 3.1 | CRITICAL |
|
3.9 | 5.9 | [email protected] |
| 9.8 | 3.1 | CRITICAL |
|
3.9 | 5.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2023-6816: 2 source package rows (xorg-server, xwayland); 44 state rows across 5 repos (3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 16, open 28. | https://security.alpinelinux.org/vuln/CVE-2023-6816 |
debian
|
not yet assigned | CVE-2023-6816 not yet assigned priority: Debian including 2 source packages (xorg-server, xwayland), 9 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 8, open 1. | https://security-tracker.debian.org/tracker/CVE-2023-6816 |
gentoo
|
normal | CVE-2023-6816: 1 GLSA(s) (202401-30), 2 atom(s) (x11-base/xorg-server, x11-base/xwayland); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2023-6816 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2023-6816 |
suse
|
high | — | https://www.suse.com/security/cve/CVE-2023-6816/ |
ubuntu
|
medium | CVE-2023-6816 medium priority: Ubuntu including 11 source packages (xorg, xorg-hwe-16.04, …), 132 status rows across 12 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 84, released 19, not-affected 14, needs-triage 10, ignored 5. | https://ubuntu.com/security/CVE-2023-6816 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| x.org | x_server | < 21.1.11 | cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:* |
| x.org | xwayland | < 23.2.4 | cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:* |
| fedoraproject | fedora | 39 | cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* |
| redhat | enterprise_linux_desktop | 7.0 | cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_server | 7.0 | cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_workstation | 7.0 | cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* |
| debian | debian_linux | 10.0 | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* |