CVE-2021-20196 - CVE House

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Status published Medium CVE-2021-20196

A NULL pointer dereference flaw was found in the floppy...

6.5 CVSS

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

More from n/a

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Affected Vendor

n/a

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Affected Software

qemu

Vulnerable Versions:

vulnerable up to (including) qemu 5.2.0

Timeline

Official Publish: May 26th, 2021

Last Modified: August 3rd, 2024

Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1499 Endpoint Denial of Service

T1499.004 Application or System Exploitation

T1489 Service Stop

T1203 Exploitation for Client Execution

T1190 Exploit Public-Facing Application