Linux Distros Unpatched Vulnerability : CVE-2021-4206

high Nessus Plugin ID 224254

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

- A flaw was found in the QXL display device emulation in QEMU. An integer overflow in the cursor_alloc() function can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer overflow. This flaw allows a malicious privileged guest user to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU process. (CVE-2021-4206)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

Plugin Details

Severity: High

ID: 224254

File Name: unpatched_CVE_2021_4206.nasl

Version: 1.4

Type: Local

Agent: unix

Family: Misc.

Published: 3/5/2025

Updated: 6/10/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 4.1

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2021-4206

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.8

Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:U/RC:C

Vulnerability Information

CPE: p-cpe:/a:centos:centos:qemu-kvm-block-gluster, p-cpe:/a:centos:centos:qemu-kvm-block-iscsi, p-cpe:/a:centos:centos:qemu-kvm-common, p-cpe:/a:redhat:enterprise_linux:qemu-guest-agent, p-cpe:/a:centos:centos:qemu-kvm-docs, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-ui-spice, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-block-rbd, p-cpe:/a:redhat:enterprise_linux:qemu-img, p-cpe:/a:redhat:enterprise_linux:qemu-kiwi, p-cpe:/a:centos:centos:qemu-kvm-core, p-cpe:/a:redhat:enterprise_linux:qemu-kvm, p-cpe:/a:centos:centos:qemu-kiwi, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-block-curl, p-cpe:/a:centos:centos:qemu-kvm, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-ui-opengl, p-cpe:/a:centos:centos:qemu-kvm-block-ssh, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-docs, cpe:/o:centos:centos:8, p-cpe:/a:centos:centos:qemu-guest-agent, p-cpe:/a:centos:centos:qemu-kvm-block-rbd, p-cpe:/a:centos:centos:qemu-kvm-hw-usbredir, cpe:/a:redhat:advanced_virtualization:8::el8, cpe:/o:redhat:enterprise_linux:8, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-core, p-cpe:/a:centos:centos:qemu-kvm-ui-opengl, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-tests, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-block-iscsi, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-block-ssh, p-cpe:/a:centos:centos:qemu-img, p-cpe:/a:centos:centos:qemu-kvm-block-curl, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-block-gluster, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-hw-usbredir, p-cpe:/a:centos:centos:qemu-kvm-ui-spice, p-cpe:/a:centos:centos:qemu-kvm-tests, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-common

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 4/29/2022

Reference Information

CVE: CVE-2021-4206

Detections

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