CVE Tools
Sign in

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
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
1.3%
Top 34.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

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
Open in CVSS calculator →

Weaknesses

CWE-476

Affected Products

qemuqemu
On-prem
Cloud & SaaS / virtualization
enterprise linuxredhat
On-premOS
Operating Systems / linux-distro
Red Hat Enterprise LinuxRed Hat Inc.
On-premOS
Operating Systems / linux-distro
QEMUFabrice Bellard
Library
OSS Libraries / generic-library
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
qemuoss-projectUSCloud & SaaS
redhatcommercialUSOperating Systemsaka red hat
red hat inc.commercialUSOperating Systemsaka red hat
fabrice bellardindividual-devFRCloud & SaaS
ооо «ред софт»commercialRUOperating Systemsaka red soft
and 9 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available
Workaround Available

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 →

Timeline

Published
Jan 12, 2024
Last Updated
May 2, 2025

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2023-6683 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