CVE-2023-6478

HIGHNVD 7.67.6—

7.6

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.

CVSS v3: 7.6
EG Score: 7.6(medium)
EPSS: 78.5%
KEV: Not listed

Published

December 13, 2023

Last Modified

August 4, 2025

References (46)

secalert@redhathttps://access.redhat.com/errata/RHSA-2023:7886
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0006
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0009
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0010
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0014
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0015
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0016
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0017
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0018
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:0020
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:2169
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:2170
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:2995
secalert@redhathttps://access.redhat.com/errata/RHSA-2024:2996
secalert@redhathttps://access.redhat.com/errata/RHSA-2025:12751

Patch Availability(18)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	xvfb (2:1.15.1-0ubuntu2.11+esm9) @ trusty	2026-05-24	ubuntu
ubuntu	xwayland (2:1.18.4-0ubuntu0.12+esm8) @ xenial	2026-05-24	ubuntu
ubuntu	xwayland (2:23.2.0-1ubuntu0.3) @ mantic	2026-05-24	ubuntu
redhat	tigervnc-0:1.1.0-25.el6_10.13	2025-08-04	redhat
redhat	xorg-x11-server-0:1.20.11-22.el8	2024-05-22	redhat
redhat	xorg-x11-server-Xwayland-0:21.1.3-15.el8	2024-05-22	redhat
redhat	xorg-x11-server-Xwayland-0:22.1.9-5.el9	2024-04-30	redhat
redhat	xorg-x11-server-0:1.20.11-24.el9	2024-04-30	redhat
redhat	tigervnc-0:1.9.0-15.el8_2.6	2024-01-02	redhat
redhat	tigervnc-0:1.13.1-2.el8_9.4	2024-01-02	redhat
redhat	tigervnc-0:1.8.0-28.el7_9	2024-01-02	redhat
redhat	tigervnc-0:1.13.1-3.el9_3.3	2024-01-02	redhat
redhat	tigervnc-0:1.11.0-22.el9_0.5	2024-01-02	redhat
redhat	xorg-x11-server-0:1.20.4-25.el7_9	2024-01-02	redhat
redhat	tigervnc-0:1.11.0-8.el8_4.5	2024-01-02	redhat
redhat	tigervnc-0:1.12.0-6.el8_6.6	2024-01-02	redhat
redhat	tigervnc-0:1.12.0-15.el8_8.4	2024-01-02	redhat
redhat	tigervnc-0:1.12.0-14.el9_2.2	2023-12-20	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(19)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 13× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-05 22:46 UTCepss_batch
2026-06-05 22:46 UTCepss_batch
2026-06-05 06:09 UTCepss_batch
2026-06-05 06:09 UTCepss_batch
2026-06-04 13:11 UTCepss_batch
2026-06-04 13:11 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:43 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch

Frequently asked(5)

What is CVE-2023-6478?

CVE-2023-6478 is a high vulnerability published on December 13, 2023. 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.

When was CVE-2023-6478 disclosed?

CVE-2023-6478 was first published in the National Vulnerability Database on December 13, 2023, with the most recent update on August 4, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-6478 actively exploited?

CVE-2023-6478 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 78.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-6478?

CVE-2023-6478 has a CVSS v3 base score of 7.6 (NVD).

How do I remediate CVE-2023-6478?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-6478, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2023-6478

Published

Last Modified

References (46)

Patch Availability(18)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-6478?

CVE-2023-6478

Published

Last Modified

References (46)

Patch Availability(18)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-6478?

Same vendor

Same CWE

CVE-2023-6478

📅 Published

🔄 Last Modified

🔗 References (46)

Patch Availability(18)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-6478?

CVE-2023-6478

📅 Published

🔄 Last Modified

🔗 References (46)

Patch Availability(18)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-6478?

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