CVE Tools
Sign in

CVE-2023-6816

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

Published: Jan 18, 2024Updated: Aug 29, 2025 Sources: CVE List NVD BDUCWE-787
9.8CRITICAL
NVD MITRE
EPSS Score
2.1%
Top 20.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the X.Org Server was only allocating space for the device's particular number of buttons, leading to a heap overflow if a bigger value was used.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-787

Affected Products

Red Hat Inc.
commercial·USaka redhat, Red Hat
Red Hat Enterprise Linux 7On-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONOn-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 8.2 Advanced Update SupportOn-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 8.2 Telecommunications Update ServiceOn-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 8.2 Update Services for SAP SolutionsOn-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportOn-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceOn-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsOn-premOS
Operating Systems / linux-distro
АО «НТЦ ИТ РОСА»
commercial·RU
РОСА КобальтOn-prem
Operating Systems / linux-distro
РОСА ХРОМOn-prem
Operating Systems / linux-distro
x.org
oss-project·US
x serverOn-prem
Operating Systems / unix-bsd
xwaylandOn-prem
Operating Systems / linux-distro
ООО «Ред Софт»
commercial·RUaka red soft
РЕД ОСOn-premOS
Operating Systems / linux-distro
ООО «РусБИТех-Астра»
commercial·RUaka rusbitech-astra
Astra Linux Special EditionOn-premOS
Operating Systems / linux-distro
АО «ИВК»
commercial·RUaka ivk
АЛЬТ СП 10On-premOS
Operating Systems / linux-distro
and 17 more affected products View all →

Exploitability

Official Patch Available
Workaround Available
Is your org exposed to CVE-2023-6816?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

http://www.openwall.com/lists/oss-security/2024/01/18/1
openwall.com
https://access.redhat.com/security/cve/CVE-2023-6816
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2257691
bugzilla.redhat.com
and 31 more references View all →

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2023-6816 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows