CVE-2023-3255

MEDIUM

QEMU < 8.0.3 - Authenticated Denial of Service via VNC ClientCutText Message Handling

Title source: llm
STIX 2.1

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.

References (5)

Core 5
Core References
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2024:2135
Third Party Advisory vdb-entry x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2023-3255
Issue Tracking, Patch, Third Party Advisory issue-tracking x_refsource_redhat
https://bugzilla.redhat.com/show_bug.cgi?id=2218486
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2024:2962

Scores

CVSS v3 6.5
EPSS 0.0140
EPSS Percentile 69.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-835
Status published
Products (4)
fedoraproject/fedora 38
qemu/qemu < 8.0.3
redhat/enterprise_linux 8.0
redhat/enterprise_linux 9.0
Published Sep 13, 2023
Tracked Since Feb 18, 2026