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CVE-2023-6683

Qemu: vnc: null pointer dereference in qemu_clipboard_request()

Published: Jan 12, 2024Updated: May 2, 2025 Sources: CVE List NVD BDUCWE-476
6.5MEDIUM
NVD MITRE
EPSS Score
1.3%
Top 33.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. The qemu_clipboard_request() function can be reached before vnc_server_cut_text_caps() was called and had the chance to initialize the clipboard peer, leading to a NULL pointer dereference. This could allow a malicious authenticated VNC client to crash QEMU and trigger a denial of service.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-476

Affected Products

Red Hat Inc.
commercial·USaka redhat, Red Hat
Red Hat Enterprise Linux 8On-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 8 Advanced VirtualizationOn-premOS
Operating Systems / linux-distro
qemu
oss-project·US
qemuOn-prem
Cloud & SaaS / virtualization
Fabrice Bellard
individual-dev·FR
QEMULibrary
OSS Libraries / generic-library
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 7 more affected products View all →

Exploitability

Official Patch Available
Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Impact
Initial Access
View detailed technique mapping

References

https://access.redhat.com/errata/RHSA-2024:2135
access.redhat.com
https://access.redhat.com/errata/RHSA-2024:2962
access.redhat.com
https://access.redhat.com/security/cve/CVE-2023-6683
access.redhat.com
and 10 more references View all →

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