CVE-2021-20203

low-risk
Published 2021-02-25

An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0. It may occur if a guest was to supply invalid values for rx/tx queue size or other NIC parameters. A privileged guest user may use this flaw to crash the QEMU process on the host resulting in DoS scenario.

Do I need to act?

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0.03% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
3
CVSS 3.2/10 Low
LOCAL / LOW complexity

Affected Products (4)

Affected Vendors

Debian Fedoraproject Qemu

References (10)

Exploit https://bugs.launchpad.net/qemu/+bug/1913873
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1922441
Mailing List https://lists.debian.org/debian-lts-announce/2021/04/msg00009.html
Mailing List https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
Third Party Advisory https://security.gentoo.org/glsa/202208-27
Exploit https://bugs.launchpad.net/qemu/+bug/1913873
Issue Tracking https://bugzilla.redhat.com/show_bug.cgi?id=1922441
Mailing List https://lists.debian.org/debian-lts-announce/2021/04/msg00009.html
Mailing List https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html
Third Party Advisory https://security.gentoo.org/glsa/202208-27
22
/ 100
low-risk
Severity 12/34 · Low
Exploitability 0/34 · Minimal
Exposure 10/34 · Low