CVE-2023-6683: Qemu

Medium severity, CVSS 6.5. EPSS: 1.3% chance of exploitation in the next 30 days.

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.

Affected products

• Qemu Qemu: from 6.1.0, before 8.2.2 (fixed in 8.2.2)
• Red Hat Enterprise Linux: version 8.0 only; version 9.0 only

Published 2024-01-12. Last modified 2026-06-17.