CVE-2023-6683
This could allow a malicious authenticated VNC client to crash QEMU and trigger a denial of service.
Does this matter?
Lower severity and a low EPSS score (1.26%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.26% probability · 69th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- qemu/qemu · redhat/enterprise linux
- Source
- secalert@redhat.com
EPSS 1.3% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.