CVEvulnerability
CVE-2021-20196
6.5 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2021-05-26
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 6.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
- CVSS 2.0 ([email protected])
- 2.1 LOW — AV:L/AC:L/Au:N/C:N/I:N/A:P
- Weaknesses
- CWE-476
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.
Affected configurations
• qemu qemu 5.2.0
• debian debian linux 9.0
• debian debian linux 10.0
Related
Weakness · CWE (1)
- CWE-476 NULL Pointer Dereference weakness
References
- https://bugs.launchpad.net/qemu/+bug/1912780 Exploit, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210708-0004/ Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/01/28/1 Mailing List, Patch, Third Party Advisory
- https://bugs.launchpad.net/qemu/+bug/1912780 Exploit, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210708-0004/ Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/01/28/1 Mailing List, Patch, Third Party Advisory