CVE-2020-29040

Name: CVE-2020-29040
Creator: NVD / NIST
Published: 2020-11-24T17:15:11.177+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.37%

Last modified Jun 17, 2026

CVE-2020-29040 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. An issue was discovered in Xen through 4.14.x allowing x86 HVM guest OS users to cause a denial of service (stack corruption), cause a data leak, or possibly gain privileges because of an off-by-one error. NOTE: this issue is caused by an incorrect fix for CVE-2020-27671.. EPSS estimates a 0.37% chance of exploitation in the next 30 days.

Description

An issue was discovered in Xen through 4.14.x allowing x86 HVM guest OS users to cause a denial of service (stack corruption), cause a data leak, or possibly gain privileges because of an off-by-one error. NOTE: this issue is caused by an incorrect fix for CVE-2020-27671.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.37%

29.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Xen	Xen	<= 4.14.0

References

http://www.openwall.com/lists/oss-security/2021/01/19/4Mailing List, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-355.htmlVendor Advisory
https://xenbits.xen.org/xsa/advisory-355.htmlVendor Advisory
http://www.openwall.com/lists/oss-security/2021/01/19/4Mailing List, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-355.htmlVendor Advisory
https://xenbits.xen.org/xsa/advisory-355.htmlVendor Advisory

Timeline

Published: Nov 24, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-29040?

How severe is CVE-2020-29040?

CVE-2020-29040 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days.

How do I fix CVE-2020-29040?

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-2020-29040?

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

Scan your code now

Source: NVD / NIST