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.
CVE-2023-6683
CVSS base score
6.5 (v3.1)
Severity
MEDIUM
Attack vector
Network
Weakness
CWE-476
Last modified
November 5, 2026
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected products
qemu qemu
redhat enterprise linux
References
- access.redhat.com Third Party Advisory
- access.redhat.com Third Party Advisory
- access.redhat.com Third Party Advisory
- bugzilla.redhat.com Issue Tracking, Patch
- access.redhat.com Third Party Advisory
- access.redhat.com Third Party Advisory
- access.redhat.com Third Party Advisory
- bugzilla.redhat.com Issue Tracking, Patch
- security.netapp.com Third Party Advisory