Dashboard / CVE-2023-6683

CVE-2023-6683

MEDIUM
MEDIUM Priority: 0.08 BB Relevance: 63/100
Published: 2024-01-12 Modified: 2026-11-05 First seen: 2026-11-05 Status: active

Attack Surface

Network Low Complexity No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: Low
UI: None
S: Unchanged
C: None
I: None
A: High

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.

Weakness Classification (1)

Affected Software (3)

VendorProductVersion
qemu qemu 6.1.0 – 8.2.2
redhat enterprise_linux 8.0
redhat enterprise_linux 9.0

References & Advisories (5)

https://access.redhat.com/errata/RHSA-2024:2135
vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:2962
vendor-advisory x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2254825
issue-tracking x_refsource_REDHAT

Bug Bounty Relevance

63 / 100
✓ Network accessible
✓ Low complexity
✓ No user interaction

CVSS Score

6.5 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploitation Probability

1.26%
Raw Score 0.012610
Percentile 70.1%
Date 2026-11-13

EPSS Trend

2026-11-13
0.01261
2026-11-12
0.01261
2026-11-10
0.01261
2026-11-09
0.01261
2026-11-08
0.01261
2026-11-07
0.01261
2026-11-06
0.01261
2026-11-05
0.01261
2026-11-04
0.01261

Intelligence Sources

mitre ref →
nvd ref →

External Links