CVE-2023-6683

Advisory lineage Upstream: 0 Downstream: 9
Analyzed
Published: 12 Jan 2024, 19:01
Last modified:25 Feb 2026, 18:20

Vulnerability Summary

Overall Risk (default)
medium
26/100
CVSS Score
6.5 MEDIUM
v3.1 (cve.org)
EPSS Score
0.07% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

12 Jan 2024, 19:01
Published
Vulnerability first disclosed
25 Feb 2026, 18:20
Last Modified
Vulnerability information updated

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 Metrics

  • v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.07%• Percentile: 21%

Techniques & Countermeasures

  • CWE-476•NULL Pointer Dereference

    The product dereferences a pointer that it expects to be valid but is NULL.

Affected Systems

  • qemu•qemu

    ≥ 6.1.0, < 8.2.2

  • redhat•enterprise_linux

    8.0 | 9.0

References (5)