CVE-2023-6683
Qemu: vnc: null pointer dereference in qemu_clipboard_request()
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-476 |
| Vendor | red hat |
| Product | red hat enterprise linux 8 |
| Published | Jan 12, 2024 |
| Last Updated | Feb 25, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 8 Advanced Virtualization
All versions affected References
access.redhat.com: 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 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2254825 security.netapp.com: https://security.netapp.com/advisory/ntap-20240223-0001/
Credits
Red Hat would like to thank Fiona Ebner (Proxmox) and Markus Frank (Proxmox) for reporting this issue.