CVE-2021-20196 Information

Description

A NULL pointer dereference flaw was found in the floppy disk emulator of QEMU. This issue occurs while processing read/write ioport commands if the selected floppy drive is not initialized with a block device. This flaw allows a privileged guest user to crash the QEMU process on the host resulting in a denial of service. The highest threat from this vulnerability is to system availability.

CVSS Vector

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

Reference

https://bugs.launchpad.net/qemu/+bug/1912780 https://www.openwall.com/lists/oss-security/2021/01/28/1 https://security.netapp.com/advisory/ntap-20210708-0004/ https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

6.5