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Fencer Vulns
medium 4.4

CVE-2020-28368 json

Xen through 4.14.x allows guest OS administrators to obtain sensitive information (such as AES keys from outside the guest) via a side-chan…

published 2020-11-10 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-20827

cvss
4.4
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

Xen through 4.14.x allows guest OS administrators to obtain sensitive information (such as AES keys from outside the guest) via a side-channel attack on a power/energy monitoring interface, aka a "Platypus" attack. NOTE: there is only one logically independent fix: to change the access control for each such interface in Xen.

Patch / fix

  • xen Debian 14, Debian 13, Debian 12 4.14.0+80-gd101b417b7-1

debian advisories DEBIAN-CVE-2020-28368

  • xen SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +6 more 4.12.4_08-3.43.3
  • xen SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 4.12.4_09-3.39.3
  • xen SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 4.7.6_12-43.70.1
  • kernel-azure SLE Module for Public Cloud 15 SP2 5.3.18-18.29.1
  • kernel-syms-azure SLE Module for Public Cloud 15 SP2 5.3.18-18.29.1
  • kernel-source-azure SLE Module for Public Cloud 15 SP2 5.3.18-18.29.1
  • xen SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 4.11.4_14-2.45.1
  • xen SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 4.9.4_14-3.77.1

suse advisories SUSE-SU-2021:1460-1SUSE-SU-2021:1023-1SUSE-SU-2020:3742-1SUSE-SU-2020:3713-1SUSE-SU-2020:14557-1SUSE-SU-2020:3653-1

  • xen openSUSE Tumbleweed 4.15.1_01-1.2
  • xen openSUSE Leap 15.1 4.12.4_04-lp151.2.33.1
  • xen openSUSE Leap 15.2 4.13.2_04-lp152.2.18.1
  • xen openSUSE Leap 15.1 4.12.4_02-lp151.2.30.1
  • xen openSUSE Leap 15.2 4.13.2_02-lp152.2.15.1

opensuse advisories openSUSE-SU-2024:11520-1openSUSE-SU-2020:2192-1openSUSE-SU-2020:2162-1openSUSE-SU-2020:2030-1openSUSE-SU-2020:2017-1

  • xen Alpine 3.10 4.12.4-r0
  • xen Alpine 3.12, Alpine 3.11 4.13.2-r1
  • xen Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 4.14.0-r2

alpine advisories ALPINE-CVE-2020-28368

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-28368 updated cvss 5.6

xen: information leak via power sidechannel

  • Red Hat Enterprise Linux 5 kernel-xen
    affected: workaround, no fix planned “There is no known mitigation for this flaw apart from applying the patch.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 4.4 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.