CVE-2020-27821

Name: CVE-2020-27821
Creator: NVD / NIST
Published: 2020-12-08T22:15:18.587+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2020-27821 is a medium-severity vulnerability rated 6/10 on the CVSS scale. 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. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6/10

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

EPSS Probability

0.36%

27.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Qemu	Qemu	< 5.2.0
Debian	Debian Linux	10.0

References

http://www.openwall.com/lists/oss-security/2020/12/16/6Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1902651Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210115-0006/Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/12/16/6Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1902651Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00008.htmlMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20210115-0006/Third Party Advisory

Timeline

Published: Dec 8, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27821?

How severe is CVE-2020-27821?

CVE-2020-27821 has a CVSS score of 6/10 (MEDIUM severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27821?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-27821?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST