CVE-2021-20181

high
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 race condition flaw was found in the 9pfs server implementation of QEMU up to and including 5.2.0. This flaw allows a malicious 9p client to cause a use-after-free error, potentially escalating their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity as well as system availability.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1927007

https://lists.debian.org/debian-lts-announce/2021/02/msg00024.html

https://www.zerodayinitiative.com/advisories/ZDI-21-159/

Details

Source: MITRE

Published: 2021-05-13

Updated: 2021-07-20

Type: CWE-416

Risk Information

CVSS v2

Base Score: 6.9

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

Impact Score: 10

Exploitability Score: 3.4

Severity: MEDIUM

CVSS v3

Base Score: 7.5

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

Impact Score: 6

Exploitability Score: 0.8

Severity: HIGH

Vulnerable Software

Configuration 1

OR

cpe:2.3:a:qemu:qemu:*:*:*:*:*:*:*:* versions up to 5.2.0 (inclusive)

Configuration 2

OR

cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

Tenable Plugins

View all (16 total)

IDNameProductFamilySeverity
156382EulerOS Virtualization 3.0.2.0 : qemu (EulerOS-SA-2021-2844)NessusHuawei Local Security Checks
high
151564EulerOS Virtualization 2.9.1 : qemu (EulerOS-SA-2021-2192)NessusHuawei Local Security Checks
high
151557EulerOS Virtualization 2.9.0 : qemu (EulerOS-SA-2021-2211)NessusHuawei Local Security Checks
high
150537SUSE SLES11 Security Update : kvm (SUSE-SU-2021:14704-1)NessusSuSE Local Security Checks
high
148966SUSE SLES12 Security Update : qemu (SUSE-SU-2021:1305-1)NessusSuSE Local Security Checks
high
148761SUSE SLES12 Security Update : qemu (SUSE-SU-2021:1241-1)NessusSuSE Local Security Checks
high
148758SUSE SLES12 Security Update : qemu (SUSE-SU-2021:1240-1)NessusSuSE Local Security Checks
high
148757SUSE SLES15 Security Update : qemu (SUSE-SU-2021:1244-1)NessusSuSE Local Security Checks
high
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
148545Oracle Linux 7 : qemu (ELSA-2021-9109)NessusOracle Linux Local Security Checks
high
148544Oracle Linux 7 : qemu (ELSA-2021-9104)NessusOracle Linux Local Security Checks
high
146938openSUSE Security Update : qemu (openSUSE-2021-363)NessusSuSE Local Security Checks
high
146643SUSE SLED15 / SLES15 Security Update : qemu (SUSE-SU-2021:0521-1)NessusSuSE Local Security Checks
high
146609Debian DLA-2560-1 : qemu security updateNessusDebian Local Security Checks
high
146303Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 20.10 : QEMU vulnerabilities (USN-4725-1)NessusUbuntu Local Security Checks
high