{"schema_version":"1.7.5","id":"CVE-2021-20196","published":"2021-05-26T22:15:07.907Z","modified":"2026-07-08T05:58:49.818469729Z","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"],"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.","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/qemu/qemu","events":[{"introduced":"553032db17440f8de011390e5a1cfddd13751b0b"},{"last_affected":"553032db17440f8de011390e5a1cfddd13751b0b"}],"database_specific":{"cpe":"cpe:2.3:a:qemu:qemu:5.2.0:-:*:*:*:*:*:*","extracted_events":[{"introduced":"5.2.0-NA"},{"last_affected":"5.2.0-NA"}],"source":"CPE_STRING"}}],"versions":["5.2.0-NA","v5.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-20196.json"}},{"ranges":[{"type":"GIT","repo":"https://gitlab.com/qemu-project/qemu","events":[{"introduced":"553032db17440f8de011390e5a1cfddd13751b0b"},{"last_affected":"553032db17440f8de011390e5a1cfddd13751b0b"}],"database_specific":{"cpe":"cpe:2.3:a:qemu:qemu:5.2.0:-:*:*:*:*:*:*","extracted_events":[{"introduced":"5.2.0-NA"},{"last_affected":"5.2.0-NA"}],"source":"CPE_STRING"}}],"versions":["5.2.0-NA","v5.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-20196.json"}}],"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"}],"database_specific":{"unresolved_ranges":[{"cpes":["cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"9.0"},{"last_affected":"9.0"},{"introduced":"10.0"},{"last_affected":"10.0"}],"source":"CPE_STRING","vendor_product":"debian:debian_linux"}]},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H"}]}