CVE-2023-3255

Qemu: vnc: infinite loop in inflate_buffer() leads to denial of service

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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.13%
Vendor Advisory redhat.com Vendor Advisory redhat.com
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 6
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 8 Advanced Virtualization
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2024:2135 vendor advisory
https://access.redhat.com/errata/RHSA-2024:2962 vendor advisory
https://access.redhat.com/security/cve/CVE-2023-3255 vdb entry third party advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2218486 issue tracking third party advisory patch
https://security.netapp.com/advisory/ntap-20231020-0008/

Frequently Asked Questions

What is the severity of CVE-2023-3255?
CVE-2023-3255 has been scored as a medium severity vulnerability.
How to fix CVE-2023-3255?
To fix CVE-2023-3255, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-3255 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-3255 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-3255?
CVE-2023-3255 affects Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 6, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 8 Advanced Virtualization.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.