CVE-2021-20196

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-20196
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.

6.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.0 / Impact : 4.0

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope CHANGED

2.1 /10

CVSS v2.0 : LOW

V2 Legend

Vector : AV:L/AC:L/Au:N/C:N/I:N/A:P

Exploitability : 3.9 / Impact : 2.9

Access Vector LOCAL

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References
Link Resource
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
Configurations

Configuration 1 (hide)

cpe:2.3:a:qemu:qemu:5.2.0:-:*:*:*:*:*:*

Configuration 2 (hide)

OR cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
History

21 Nov 2024, 05:46

Type Values Removed Values Added
References () https://bugs.launchpad.net/qemu/+bug/1912780 - Exploit, Patch, Third Party Advisory () https://bugs.launchpad.net/qemu/+bug/1912780 - Exploit, Patch, Third Party Advisory
References () https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html - Mailing List, Third Party Advisory () https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html - Mailing List, Third Party Advisory
References () https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html - Mailing List, Third Party Advisory () https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html - Mailing List, Third Party Advisory
References () https://security.netapp.com/advisory/ntap-20210708-0004/ - Third Party Advisory () https://security.netapp.com/advisory/ntap-20210708-0004/ - Third Party Advisory
References () https://www.openwall.com/lists/oss-security/2021/01/28/1 - Mailing List, Patch, Third Party Advisory () https://www.openwall.com/lists/oss-security/2021/01/28/1 - Mailing List, Patch, Third Party Advisory

05 Sep 2022, 06:15

Type Values Removed Values Added
References
  • (MLIST) https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html -

26 Apr 2022, 16:38

Type Values Removed Values Added
CPE cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
References (CONFIRM) https://security.netapp.com/advisory/ntap-20210708-0004/ - (CONFIRM) https://security.netapp.com/advisory/ntap-20210708-0004/ - Third Party Advisory
References (MLIST) https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html - (MLIST) https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html - Third Party Advisory

04 Apr 2022, 16:15

Type Values Removed Values Added
References
  • (CONFIRM) https://security.netapp.com/advisory/ntap-20210708-0004/ -
  • (MLIST) https://lists.debian.org/debian-lts-announce/2022/04/msg00002.html -

04 Jun 2021, 15:05

Type Values Removed Values Added
CPE cpe:2.3:a:qemu:qemu:5.2.0:-:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown 		v2 : 2.1
v3 : 6.5
References (MISC) https://www.openwall.com/lists/oss-security/2021/01/28/1 - (MISC) https://www.openwall.com/lists/oss-security/2021/01/28/1 - Mailing List, Patch, Third Party Advisory
References (MISC) https://bugs.launchpad.net/qemu/+bug/1912780 - (MISC) https://bugs.launchpad.net/qemu/+bug/1912780 - Exploit, Patch, Third Party Advisory

27 May 2021, 02:11

Type Values Removed Values Added
CWE CWE-476

26 May 2021, 22:15

Type Values Removed Values Added
New CVE
Information

Published : 2021-05-26 22:15

Updated : 2024-11-21 05:46

NVD link : CVE-2021-20196

Mitre link : CVE-2021-20196

CVE.ORG link : CVE-2021-20196

JSON object : View

Products Affected

qemu

  • qemu

debian

  • debian_linux
CWE
CWE-476

NULL Pointer Dereference