CVE-2023-3354

Name: CVE-2023-3354
Creator: NVD / NIST
Published: 2023-07-11T17:15:13.387+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.34%

Last modified Jun 17, 2026

CVE-2023-3354 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A flaw was found in the QEMU built-in VNC server. When a client connects to the VNC server, QEMU checks whether the current number of connections crosses a certain threshold and if so, cleans up the previous connection. EPSS estimates a 1.34% chance of exploitation in the next 30 days.

Description

A flaw was found in the QEMU built-in VNC server. When a client connects to the VNC server, QEMU checks whether the current number of connections crosses a certain threshold and if so, cleans up the previous connection. If the previous connection happens to be in the handshake phase and fails, QEMU cleans up the connection again, resulting in a NULL pointer dereference issue. This could allow a remote unauthenticated client to cause a denial of service.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.34%

67.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Qemu	Qemu	< 8.1.0	—
Qemu	Qemu	8.1.0	Rc0
Redhat	Openstack Platform	13.0	—
Redhat	Enterprise Linux	7.0	—
Redhat	Enterprise Linux	8.0	—
Redhat	Enterprise Linux	9.0	—
Fedoraproject	Fedora	38	—

References

https://access.redhat.com/security/cve/CVE-2023-3354Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2216478Issue Tracking, Patch
https://lists.debian.org/debian-lts-announce/2024/03/msg00012.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MURWGXDIF2WTDXV36T6HFJDBL632AO7R/Mailing List
https://access.redhat.com/security/cve/CVE-2023-3354Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2216478Issue Tracking, Patch
https://lists.debian.org/debian-lts-announce/2024/03/msg00012.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MURWGXDIF2WTDXV36T6HFJDBL632AO7R/Mailing List

Timeline

Published: Jul 11, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-3354?

How severe is CVE-2023-3354?

CVE-2023-3354 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.34% probability of exploitation in the next 30 days.

How do I fix CVE-2023-3354?

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-2023-3354?

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

Scan your code now

Source: NVD / NIST