CVE-2020-27821

medium
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Description

A flaw was found in the memory management API of QEMU during the initialization of a memory region cache. This issue could lead to an out-of-bounds write access to the MSI-X table while performing MMIO operations. A guest user may abuse this flaw to crash the QEMU process on the host, resulting in a denial of service. This flaw affects QEMU versions prior to 5.2.0.

References

http://www.openwall.com/lists/oss-security/2020/12/16/6

https://bugzilla.redhat.com/show_bug.cgi?id=1902651

https://security.netapp.com/advisory/ntap-20210115-0006/

Details

Source: MITRE

Published: 2020-12-08

Updated: 2021-01-15

Type: CWE-787

Risk Information

CVSS v2

Base Score: 2.1

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

Impact Score: 2.9

Exploitability Score: 3.9

Severity: LOW

CVSS v3

Base Score: 6

Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

Impact Score: 4

Exploitability Score: 1.5

Severity: MEDIUM

Vulnerable Software

Configuration 1

OR

cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:*

Tenable Plugins

View all (15 total)

IDNameProductFamilySeverity
155742Oracle Linux 8 : kvm_utils (ELSA-2021-9568)NessusOracle Linux Local Security Checks
high
155325Oracle Linux 8 : virt:ol / and / virt-devel:rhel (ELSA-2021-1762)NessusOracle Linux Local Security Checks
medium
151714openSUSE 15 Security Update : qemu (openSUSE-SU-2021:1942-1)NessusSuSE Local Security Checks
medium
150965Amazon Linux 2 : qemu (ALAS-2021-1671)NessusAmazon Linux Local Security Checks
medium
150736SUSE SLED15 / SLES15 Security Update : qemu (SUSE-SU-2021:1942-1)NessusSuSE Local Security Checks
medium
150299Oracle Linux 7 : qemu (ELSA-2021-9285)NessusOracle Linux Local Security Checks
medium
149772CentOS 8 : virt:rhel and virt-devel:rhel (CESA-2021:1762)NessusCentOS Local Security Checks
medium
149669RHEL 8 : virt:rhel and virt-devel:rhel (RHSA-2021:1762)NessusRed Hat Local Security Checks
medium
149640openSUSE Security Update : qemu (openSUSE-2021-600)NessusSuSE Local Security Checks
medium
148755SUSE SLED15 / SLES15 Security Update : qemu (SUSE-SU-2021:1243-1)NessusSuSE Local Security Checks
medium
148752SUSE SLES15 Security Update : qemu (SUSE-SU-2021:1245-1)NessusSuSE Local Security Checks
high
148751SUSE SLES12 Security Update : qemu (SUSE-SU-2021:1242-1)NessusSuSE Local Security Checks
high
147700EulerOS Virtualization 2.9.0 : qemu (EulerOS-SA-2021-1667)NessusHuawei Local Security Checks
medium
147523EulerOS Virtualization 2.9.1 : qemu (EulerOS-SA-2021-1632)NessusHuawei Local Security Checks
medium
146303Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 20.10 : QEMU vulnerabilities (USN-4725-1)NessusUbuntu Local Security Checks
high