CVE record · CVE-2023-6816

Xorg-x11-server: heap buffer overflow in devicefocusevent and procxiquerypointer

CVSS 9.8 CriticalCriticalEPSS 0.021 · 81st percentile

Critical, because:

CVSS score 9.8: 9.0 or more.

Published by the CVE Program (CNA: redhat) at 18 Jan 2024, 04:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Red Hat	Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION Package name: tigervnc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.1.0-25.el6_10.13 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 7 Package name: xorg-x11-server https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.20.4-27.el7_9 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 7 Package name: tigervnc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.8.0-31.el7_9 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8 Package name: tigervnc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.13.1-2.el8_9.7 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8 Package name: xorg-x11-server https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.20.11-22.el8 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8 Package name: xorg-x11-server-Xwayland https://access.redhat.com/downloads/content/package-browser/	unaffected 0:21.1.3-15.el8 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.2 Advanced Update Support Package name: tigervnc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.9.0-15.el8_2.9 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.2 Telecommunications Update Service Package name: tigervnc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.9.0-15.el8_2.9 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions Package name: tigervnc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.9.0-15.el8_2.9 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Package name: tigervnc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.11.0-8.el8_4.8 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.4 Telecommunications Update Service Package name: tigervnc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.11.0-8.el8_4.8 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions Package name: tigervnc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.11.0-8.el8_4.8 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Package name: tigervnc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.12.0-6.el8_6.9 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 8.8 Extended Update Support Package name: tigervnc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.12.0-15.el8_8.7 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9 Package name: tigervnc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.13.1-3.el9_3.6 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9 Package name: xorg-x11-server https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.20.11-24.el9 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9 Package name: xorg-x11-server-Xwayland https://access.redhat.com/downloads/content/package-browser/	unaffected 0:22.1.9-5.el9 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9.0 Extended Update Support Package name: tigervnc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.11.0-22.el9_0.8 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 9.2 Extended Update Support Package name: tigervnc https://access.redhat.com/downloads/content/package-browser/	unaffected 0:1.12.0-14.el9_2.5 to before * rpm Other versions: affected
Red Hat	Red Hat Enterprise Linux 6 Package name: xorg-x11-server https://access.redhat.com/downloads/content/package-browser/	No versions given Other versions: unknown

Identifiers: CVE-2023-6816
CNA: redhat
Weakness (CWE): CWE-787
Tags: Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 8.2 Advanced Update Support
Red Hat Enterprise Linux 8.2 Telecommunications Update Service
Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Red Hat Enterprise Linux 8.4 Telecommunications Update Service
Memory corruption
Published: 18 Jan 2024
Updated: 4 Nov 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.8	Critical	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CNA (redhat)

CISA KEV Not listed.
EPSS 0.021, the 81st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

18 Jan 2024, 04:31 UTC Confirmed by the CVE List
18 Jan 2024, 05:15 UTC Confirmed by NVD

Sources

References from the CNA

access.redhat.com/errata/RHSA-2024:0320 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2024:0557 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2024:0558 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2024:0597 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2024:0607 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2024:0614 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2024:0617 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2024:0621 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2024:0626 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2024:0629 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2024:2169 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2024:2170 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2024:2995 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2024:2996 vendor-advisoryredhat
access.redhat.com/errata/RHSA-2025:12751 vendor-advisoryredhat
access.redhat.com/security/cve/CVE-2023-6816 vdb-entryredhat
bugzilla.redhat.com/show_bug.cgi?id=2257691 issue-trackingredhat

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.