A flaw was found in xorg-server. Querying or changing XKB button actions such as moving from a touchpad to a mouse can result in out-of-bounds memory reads and writes. This may allow local privilege escalation or possible remote code execution in cases where X11 forwarding is involved.
Conclusion & alert: CVE-2023-6377 is rated Moderate Risk (51.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.36%). Mandatory action: Review affected assets and schedule 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 | 2025-09-02 | 0.33% | 0.36% | +0.03% |
| 2 | 2025-08-30 | 0.41% | 0.33% | -0.08% |
| 3 | 2025-05-03 | — | 0.41% | — |
Full EPSS history (14 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.8 | 3.1 | HIGH |
|
1.8 | 5.9 | [email protected] |
| 7.8 | 3.1 | HIGH |
|
1.8 | 5.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2023-6377: 1 source package rows (xorg-server); 5 state rows across 5 repos (3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 5, open 0. | https://security.alpinelinux.org/vuln/CVE-2023-6377 |
debian
|
not yet assigned | CVE-2023-6377 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-2023-6377 |
gentoo
|
normal | CVE-2023-6377: 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-2023-6377 |
redhat
|
high | — | https://access.redhat.com/security/cve/CVE-2023-6377 |
suse
|
high | — | https://www.suse.com/security/cve/CVE-2023-6377/ |
ubuntu
|
medium | CVE-2023-6377 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, not-affected 19, released 15, needs-triage 9, ignored 5. | https://ubuntu.com/security/CVE-2023-6377 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| redhat | enterprise_linux_eus | 9.2 | cpe:2.3:o:redhat:enterprise_linux_eus:9.2:*:*:*:*:*:*:* |
| debian | debian_linux | 10.0 | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* |
| debian | debian_linux | 11.0 | cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* |
| debian | debian_linux | 12.0 | cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:* |
| x.org | x_server | < 21.1.10 | cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:* |
| x.org | xwayland | < 23.2.3 | cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:* |
| tigervnc | tigervnc | — | cpe:2.3:a:tigervnc:tigervnc:-:*:*:*:*:*:*:* |