CVE-2021-20196: Debian Linux
Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.
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.
Affected products
Published 2021-05-26. Last modified 2026-06-17.