CVE-2023-6683

Name: CVE-2023-6683
Creator: NVD / NIST
Published: 2024-01-12T19:15:11.48+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.26%

Last modified Jun 17, 2026

CVE-2023-6683 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 1.26% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.26%

65.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Qemu	Qemu	>= 6.1.0, < 8.2.2
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux	9.0

References

https://access.redhat.com/errata/RHSA-2024:2135Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:2962Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-6683Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2254825Issue Tracking, Patch
https://access.redhat.com/errata/RHSA-2024:2135Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:2962Third Party Advisory
https://access.redhat.com/security/cve/CVE-2023-6683Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2254825Issue Tracking, Patch
https://security.netapp.com/advisory/ntap-20240223-0001/Third Party Advisory

Timeline

Published: Jan 12, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2023-6683?

How severe is CVE-2023-6683?

CVE-2023-6683 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.26% probability of exploitation in the next 30 days.

How do I fix CVE-2023-6683?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-6683?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST