HIGH

CVE-2023-6478

CVSS v3

7.6

HIGH

EPSS Score

1.6 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

Get an alert for each new CVE published for xorg-x11-server.

Set up CVE WatchFree account · no credit card

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-2023-6478 Red Hat Product Security720 products fixed · 9 known affected
xorg-x11-server: out-of-bounds memory read in RRChangeOutputProperty and RRChangeProviderProperty
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-2025:12751 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. A specially crafted request to RRChangeProviderProperty or RRChangeOutputProperty can trigger an integer overflow which may lead to a disclosure of sensitive information.

Technical details

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

Frequently asked questions

What is CVE-2023-6478?

Is CVE-2023-6478 actively exploited?

Active exploitation of CVE-2023-6478 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-2023-6478?

CVE-2023-6478 has a CVSS v3 base score of 7.6 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L.

Running xorg-x11-server? Hear about its next vulnerability

CVE Watch matches each new CVE to the vendors and products you list (vendor and product, not the version) and puts it in your alerts with its KEV and EPSS status.

Get alerts for this product CISA KEV additions, October 2026 Search CVEs

Already have an account? Open CVE WatchNo credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
Running this software? CVE Watch alerts you to new vulnerabilities in your products.

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database