CVE-2021-20196
qemu - security update
6.5
MEDIUM
CVSS 3.1
EPSS 0.04%
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.
How to fix CVE-2021-20196
To remediate CVE-2021-20196, upgrade the affected package to a fixed version below.
- —upgrade to 1:5.2+dfsg-11+deb11u3 or later
- —upgrade to 1:2.8+dfsg-6+deb9u17 or later
Is CVE-2021-20196 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 1:5.2+dfsg-11+deb11u3
- from 0, < 1:2.8+dfsg-6+deb9u17
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H |