CVE-2023-3255

Name: CVE-2023-3255
Creator: NVD / NIST
Published: 2023-09-13T17:15:09.877+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.41%

Last modified Jun 17, 2026

CVE-2023-3255 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. A wrong exit condition may lead to an infinite loop when inflating an attacker controlled zlib buffer in the `inflate_buffer` function. EPSS estimates a 1.41% chance of exploitation in the next 30 days.

Description

A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. A wrong exit condition may lead to an infinite loop when inflating an attacker controlled zlib buffer in the `inflate_buffer` function. This could allow a remote authenticated client who is able to send a clipboard to the VNC server to 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

1.41%

69.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Qemu	Qemu	<= 8.0.3
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux	9.0
Fedoraproject	Fedora	38

References

https://access.redhat.com/errata/RHSA-2024:2135
https://access.redhat.com/errata/RHSA-2024:2962
https://access.redhat.com/security/cve/CVE-2023-3255Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2218486Issue Tracking, Patch, Third Party Advisory
https://access.redhat.com/errata/RHSA-2024:2135
https://access.redhat.com/errata/RHSA-2024:2962
https://access.redhat.com/security/cve/CVE-2023-3255Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2218486Issue Tracking, Patch, Third Party Advisory
https://security.netapp.com/advisory/ntap-20231020-0008/

Timeline

Published: Sep 13, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-3255?

How severe is CVE-2023-3255?

CVE-2023-3255 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.41% probability of exploitation in the next 30 days.

How do I fix CVE-2023-3255?

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-2023-3255?

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

Scan your code now

Source: NVD / NIST