CVE-2021-20203 — LOW (3.2) — White Hats Nepal

Q: How severe is CVE-2021-20203?

CVE-2021-20203 has been rated LOW with a CVSS base score of 3.2/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2021-20203?

Check the references section above for vendor advisories and patch information. Affected products include: Qemu Qemu, Fedoraproject Fedora, Debian Debian Linux.

Vulnerability Description

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.

CVSS Score

3.2

LOW

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

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality

NONE

Integrity

NONE

Availability

LOW

Affected Products

Vendor	Product	Versions
Qemu	Qemu	<= 5.2.0
Fedoraproject	Fedora	33
Debian	Debian Linux	9.0

Related Weaknesses (CWE)

CWE-190

References

https://bugs.launchpad.net/qemu/+bug/1913873ExploitPatchThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1922441Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00009.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing ListThird Party Advisory
https://security.gentoo.org/glsa/202208-27Third Party Advisory
https://bugs.launchpad.net/qemu/+bug/1913873ExploitPatchThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1922441Issue TrackingPatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00009.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing ListThird Party Advisory
https://security.gentoo.org/glsa/202208-27Third Party Advisory

FAQ

What is CVE-2021-20203?

CVE-2021-20203 is a vulnerability with a CVSS score of 3.2 (LOW). 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...

How severe is CVE-2021-20203?

CVE-2021-20203 has been rated LOW with a CVSS base score of 3.2/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2021-20203?

Check the references section above for vendor advisories and patch information. Affected products include: Qemu Qemu, Fedoraproject Fedora, Debian Debian Linux.