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HIGH

CVE-2023-6377

CVSS v3

7.8

HIGH

EPSS Score

1.6 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • tigervncAlmaLinux:9all versions · fixed in 1.13.1-3.el9_3.3.alma.1and 6 other packages
  • tigervncAlmaLinux:8all versions · fixed in 1.13.1-2.el8_9.4.alma.1and 6 other packages
  • xorg-x11-server-XdmxAlmaLinux:9all versions · fixed in 1.20.11-24.el9and 7 other packages
  • xorg-x11-server-XdmxAlmaLinux:8all versions · fixed in 1.20.11-22.el8and 7 other packages
  • xorg-x11-server-XwaylandAlmaLinux:9all versions · fixed in 22.1.9-5.el9
  • xorg-x11-server-XwaylandAlmaLinux:8all versions · fixed in 21.1.3-15.el8

Vendor advisories

  • CVE-2023-6377 Red Hat Product Security720 products fixed · 9 known affected

    xorg-x11-server: out-of-bounds memory reads/writes in XKB button actions

    xorg-x11-server-Xdmx as a component of Red Hat Enterprise Linux 6 · xorg-x11-server-Xephyr as a component of Red Hat Enterprise Linux 6 · xorg-x11-server-Xnest as a component of Red Hat Enterprise Linux 6

  • RHSA-2025:13998 Red Hat Product Security15 products fixed

    Red Hat Security Advisory: tigervnc security update

  • RHSA-2024:2996 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: xorg-x11-server-Xwayland security update

  • RHSA-2024:2995 Red Hat Product Security94 products fixed

    Red Hat Security Advisory: xorg-x11-server security update

  • RHSA-2024:2169 Red Hat Product Security94 products fixed

    Red Hat Security Advisory: xorg-x11-server security update

  • RHSA-2024:2170 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: xorg-x11-server-Xwayland security update

10 more advisories

Full record on NVD

Description

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2023-12-13
Last Modified
2026-06-23

Frequently asked questions

What is CVE-2023-6377?

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.

Is CVE-2023-6377 actively exploited?

Active exploitation of CVE-2023-6377 has not been confirmed. Its EPSS score was 1.6% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-6377?

CVE-2023-6377 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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