CVE-2021-20196

Aliases:DEBIAN-CVE-2021-20196
Advisory lineage Upstream: 0 Downstream: 15
Modified
Published: 26 May 2021, 21:16
Last modified:03 Aug 2024, 17:30

Vulnerability Summary

Overall Risk (default)
medium
36/100
CVSS Score
6.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.48% LOW
0% probability +0.44%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

26 May 2021, 21:16
Published
Vulnerability first disclosed
03 Aug 2024, 17:30
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
  • v2.0•LOW•Score: 2.1AV:L/AC:L/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 0.48%• Percentile: 40%

Techniques & Countermeasures

  • CWE-476•NULL Pointer Dereference

    The product dereferences a pointer that it expects to be valid but is NULL.

Affected Systems

  • debian•qemu

    < 1:5.2+dfsg-11+deb11u3 | < 1:6.2+dfsg-1 | < 1:6.2+dfsg-1 | < 1:6.2+dfsg-1

  • debian•debian_linux

    9.0 | 10.0

  • qemu•qemu

    5.2.0

References (6)