CVE Database›Document archive›CVE-2020-23793

CVE-2020-23793

spice: Improper input validation in function async_READ_handler

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Severity

Moderate

Red Hat Product Security

7.4

CVSS 3.1

Review impact separately from score.

Published · August 22, 2023

Updated · November 22, 2025

Description

A flaw was found in spice-server in Redhat's VDI product that can restart KVMvirtual machine without any authorization. A handshake is required before spice-server and spice-client can establish communication, and spice-client will send a request containing information that the server needs. This TCP request requires only host and port; A malformed TCP packet causes the vm to crash and the QEMu-KVM process to be restarted.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

CVSS / CWE

CVSS 3.1 · 7.4
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CWE-20 · Improper Input Validation