CVE-2020-25599

Name: CVE-2020-25599
Creator: NVD / NIST
Published: 2020-09-23T22:15:13.477+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7/10EPSS 0.29%

Last modified Jun 17, 2026

CVE-2020-25599 is a high-severity vulnerability rated 7/10 on the CVSS scale. An issue was discovered in Xen through 4.14.x. There are evtchn_reset() race conditions. EPSS estimates a 0.29% chance of exploitation in the next 30 days.

Description

An issue was discovered in Xen through 4.14.x. There are evtchn_reset() race conditions. Uses of EVTCHNOP_reset (potentially by a guest on itself) or XEN_DOMCTL_soft_reset (by itself covered by XSA-77) can lead to the violation of various internal assumptions. This may lead to out of bounds memory accesses or triggering of bug checks. In particular, x86 PV guests may be able to elevate their privilege to that of the host. Host and guest crashes are also possible, leading to a Denial of Service (DoS). Information leaks cannot be ruled out. All Xen versions from 4.5 onwards are vulnerable. Xen versions 4.4 and earlier are not vulnerable.

Metrics

CVSS 3.1

7/10

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

EPSS Probability

0.29%

20.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Xen	Xen	>= 4.5.0, <= 4.14.0
Fedoraproject	Fedora	31
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33
Opensuse	Leap	15.2
Debian	Debian Linux	10.0

References

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00008.htmlMailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/12/16/5Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4JRXMKEMQRQYWYEPHVBIWUEAVQ3LU4FN/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DA633Y3G5KX7MKRN4PFEGM3IVTJMBEOM/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RJZERRBJN6E6STDCHT4JHP4MI6TKBCJE/
https://security.gentoo.org/glsa/202011-06Third Party Advisory
https://www.debian.org/security/2020/dsa-4769Third Party Advisory
https://xenbits.xen.org/xsa/advisory-343.htmlPatch, Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00008.htmlMailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/12/16/5Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4JRXMKEMQRQYWYEPHVBIWUEAVQ3LU4FN/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DA633Y3G5KX7MKRN4PFEGM3IVTJMBEOM/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RJZERRBJN6E6STDCHT4JHP4MI6TKBCJE/
https://security.gentoo.org/glsa/202011-06Third Party Advisory
https://www.debian.org/security/2020/dsa-4769Third Party Advisory
https://xenbits.xen.org/xsa/advisory-343.htmlPatch, Vendor Advisory

Timeline

Published: Sep 23, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-25599?

How severe is CVE-2020-25599?

CVE-2020-25599 has a CVSS score of 7/10 (HIGH severity). The EPSS model estimates a 0.29% probability of exploitation in the next 30 days.

How do I fix CVE-2020-25599?

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-2020-25599?

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

Scan your code now

Source: NVD / NIST