CVE-2020-25717: Canonical Ubuntu Linux

High severity, CVSS 8.1. EPSS: 1.6% chance of exploitation in the next 30 days.

A flaw was found in the way Samba maps domain users to local users. An authenticated attacker could use this flaw to cause possible privilege escalation.

Affected products

  • Canonical Ubuntu Linux: version 18.04 only; version 20.04 only; version 21.04 only; version 21.10 only
  • Debian Debian Linux: version 9.0 only; version 10.0 only
  • Fedoraproject Fedora: version 33 only; version 34 only; version 35 only
  • Red Hat Codeready Linux Builder: affected versions not specified
  • Red Hat Enterprise Linux: version 7.0 only; version 8.0 only
  • Red Hat Enterprise Linux Desktop: version 7.0 only
  • Red Hat Enterprise Linux Eus: version 8.2 only; version 8.4 only
  • Red Hat Enterprise Linux For IBM Z Systems: version 7.0 only; version 8.0 only
  • Red Hat Enterprise Linux For IBM Z Systems Eus: version 8.2 only; version 8.4 only
  • Red Hat Enterprise Linux For Power Big Endian: version 7.0 only
  • Red Hat Enterprise Linux For Power Little Endian: version 7.0 only; version 8.0 only
  • Red Hat Enterprise Linux For Power Little Endian Eus: version 8.2 only; version 8.4 only
  • Red Hat Enterprise Linux For Scientific Computing: version 7.0 only
  • Red Hat Enterprise Linux Resilient Storage: version 7.0 only
  • Red Hat Enterprise Linux Server: version 7.0 only
  • Red Hat Enterprise Linux Server Aus: version 8.2 only; version 8.4 only
  • Red Hat Enterprise Linux Server Tus: version 8.4 only
  • Red Hat Enterprise Linux Server Update Services For SAP Solutions: version 8.2 only; version 8.4 only
  • Red Hat Enterprise Linux Tus: version 8.2 only
  • Red Hat Enterprise Linux Workstation: version 7.0 only
  • Red Hat Gluster Storage: version 3.0 only; version 3.5 only
  • Red Hat Openstack: version 13 only; version 16.1 only; version 16.2 only
  • Red Hat Virtualization: version 4.0 only
  • Red Hat Virtualization Host: version 4.0 only
  • Samba Samba: from 3.0.0, before 4.13.14 (fixed in 4.13.14); from 4.14.0, before 4.14.10 (fixed in 4.14.10); from 4.15.0, before 4.15.2 (fixed in 4.15.2)

Published 2022-02-18. Last modified 2026-06-17.