CVE-2021-20196

Public Exploit

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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.03%
Third-Party Advisory launchpad.net Third-Party Advisory debian.org Third-Party Advisory debian.org Third-Party Advisory netapp.com Third-Party Advisory openwall.com
Affected: n/a qemu
Published at:
Updated at:

References

Link Tags
https://bugs.launchpad.net/qemu/+bug/1912780 exploit third party advisory patch
https://www.openwall.com/lists/oss-security/2021/01/28/1 mailing list third party advisory patch
https://security.netapp.com/advisory/ntap-20210708-0004/ third party advisory
https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html third party advisory mailing list
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2021-20196?
CVE-2021-20196 has been scored as a medium severity vulnerability.
How to fix CVE-2021-20196?
To fix CVE-2021-20196, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-20196 being actively exploited in the wild?
It is possible that CVE-2021-20196 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-20196?
CVE-2021-20196 affects n/a qemu.
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