{"id":"CVE-2021-20196","details":"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.","modified":"2026-05-15T12:03:15.692444269Z","published":"2021-05-26T22:15:07.907Z","related":["ALSA-2022:1759","SUSE-SU-2022:0177-1","SUSE-SU-2022:0210-1","SUSE-SU-2022:0210-2","SUSE-SU-2022:1151-1","openSUSE-SU-2022:0177-1","openSUSE-SU-2022:0210-1"],"database_specific":{"unresolved_ranges":[{"vendor_product":"debian:debian_linux","source":"CPE_FIELD","cpes":["cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"],"extracted_events":[{"last_affected":"9.0"},{"last_affected":"10.0"}]}]},"references":[{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20210708-0004/"},{"type":"FIX","url":"https://bugs.launchpad.net/qemu/+bug/1912780"},{"type":"FIX","url":"https://www.openwall.com/lists/oss-security/2021/01/28/1"}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H"}]}