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CVE-2021-20196 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://bugs.launchpad.net/qemu/+bug/1912780	CVE	ExploitPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html	CVE	Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html	CVE	Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20210708-0004/	CVE	Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/01/28/1	CVE	Mailing ListPatchThird Party Advisory
https://bugs.launchpad.net/qemu/+bug/1912780	[email protected]	ExploitPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html	[email protected]	Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html	[email protected]	Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20210708-0004/	[email protected]	Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/01/28/1	[email protected]	Mailing ListPatchThird Party Advisory

see all 10 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-476	NULL Pointer Dereference	[email protected]
CWE-476	NULL Pointer Dereference	[email protected]

Affected Products

Product	Versions
qemu qemu	5.2.0 -
CPE cpe:2.3:a:qemu:qemu:5.2.0:-:::::: Remediation No remediation found in references.
debian debian linux	9.0 10.0
CPE cpe:2.3:o:debian:debian_linux:9.0:::::::* cpe:2.3:o:debian:debian_linux:10.0:::::::* Remediation No remediation found in references.

Change History

11 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Feb 12, 2023	CVE Modified	[email protected]
Feb 2, 2023	CVE Modified	[email protected]
Sep 30, 2022	Modified Analysis	[email protected]
Sep 5, 2022	CVE Modified	[email protected]
Apr 26, 2022	Modified Analysis	[email protected]
Apr 4, 2022	CVE Modified	[email protected]
Jul 8, 2021	CVE Modified	[email protected]
Jun 4, 2021	Initial Analysis	[email protected]