CVE-2020-23793
spice: Improper input validation in function async_READ_handler
Severity
ModerateRed Hat Product Security
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 · 7.4CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE-20 · Improper Input Validation