CVE-2020-27671

Name: CVE-2020-27671
Creator: NVD / NIST
Published: 2020-10-22T21:15:13.887+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.34%

Last modified Jun 17, 2026

CVE-2020-27671 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. An issue was discovered in Xen through 4.14.x allowing x86 HVM and PVH guest OS users to cause a denial of service (data corruption), cause a data leak, or possibly gain privileges because coalescing of per-page IOMMU TLB flushes is mishandled.. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

Description

An issue was discovered in Xen through 4.14.x allowing x86 HVM and PVH guest OS users to cause a denial of service (data corruption), cause a data leak, or possibly gain privileges because coalescing of per-page IOMMU TLB flushes is mishandled.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.34%

25.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Xen	Xen	>= 4.2.0, <= 4.14.0
Opensuse	Leap	15.1
Opensuse	Leap	15.2
Debian	Debian Linux	10.0
Fedoraproject	Fedora	31

References

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00075.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00025.htmlMailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/01/19/8Mailing List, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-346.htmlPatch, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XIK57QJOVOPWH6RFRNMGOBCROBCKMDG2/
https://security.gentoo.org/glsa/202011-06Third Party Advisory
https://www.debian.org/security/2020/dsa-4804Third Party Advisory
https://xenbits.xen.org/xsa/advisory-346.htmlPatch, Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00075.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00025.htmlMailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/01/19/8Mailing List, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-346.htmlPatch, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XIK57QJOVOPWH6RFRNMGOBCROBCKMDG2/
https://security.gentoo.org/glsa/202011-06Third Party Advisory
https://www.debian.org/security/2020/dsa-4804Third Party Advisory
https://xenbits.xen.org/xsa/advisory-346.htmlPatch, Vendor Advisory

Timeline

Published: Oct 22, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-27671?

How severe is CVE-2020-27671?

CVE-2020-27671 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.

How do I fix CVE-2020-27671?

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-2020-27671?

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

Scan your code now

Source: NVD / NIST