CVE-2021-20196

medium

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.

References

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

https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html

Details

Source: MITRE

Published: 2021-05-26

Updated: 2022-09-30

Type: CWE-476

Risk Information

CVSS v2

Base Score: 2.1

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

Impact Score: 2.9

Exploitability Score: 3.9

Severity: LOW

CVSS v3

Base Score: 6.5

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

Impact Score: 4

Exploitability Score: 2

Severity: MEDIUM