CVE-2020-29570

Name: CVE-2020-29570
Creator: NVD / NIST
Published: 2020-12-15T17:15:14.753+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.2/10EPSS 0.37%

Last modified Jun 17, 2026

CVE-2020-29570 is a medium-severity vulnerability rated 6.2/10 on the CVSS scale. An issue was discovered in Xen through 4.14.x. Recording of the per-vCPU control block mapping maintained by Xen and that of pointers into the control block is reversed. EPSS estimates a 0.37% chance of exploitation in the next 30 days.

Description

An issue was discovered in Xen through 4.14.x. Recording of the per-vCPU control block mapping maintained by Xen and that of pointers into the control block is reversed. The consumer assumes, seeing the former initialized, that the latter are also ready for use. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system.

Metrics

CVSS 3.1

6.2/10

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

EPSS Probability

0.37%

29.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Xen	Xen	>= 4.4.0, <= 4.14.0
Debian	Debian Linux	10.0
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33

References

http://www.openwall.com/lists/oss-security/2020/12/16/4Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI/
https://security.gentoo.org/glsa/202107-30Third Party Advisory
https://www.debian.org/security/2020/dsa-4812Third Party Advisory
https://xenbits.xenproject.org/xsa/advisory-358.htmlPatch, Vendor Advisory
http://www.openwall.com/lists/oss-security/2020/12/16/4Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI/
https://security.gentoo.org/glsa/202107-30Third Party Advisory
https://www.debian.org/security/2020/dsa-4812Third Party Advisory
https://xenbits.xenproject.org/xsa/advisory-358.htmlPatch, Vendor Advisory

Timeline

Published: Dec 15, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-29570?

How severe is CVE-2020-29570?

CVE-2020-29570 has a CVSS score of 6.2/10 (MEDIUM severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days.

How do I fix CVE-2020-29570?

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-2020-29570?

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

Scan your code now

Source: NVD / NIST