CVE-2020-25719: Canonical Ubuntu Linux

High severity, CVSS 7.2. EPSS: 1.7% chance of exploitation in the next 30 days.

A flaw was found in the way Samba, as an Active Directory Domain Controller, implemented Kerberos name-based authentication. The Samba AD DC, could become confused about the user a ticket represents if it did not strictly require a Kerberos PAC and always use the SIDs found within. The result could include total domain compromise.

Affected products

• Canonical Ubuntu Linux: 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 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 Server Aus: version 8.2 only; version 8.4 only
• Red Hat Enterprise Linux Server Tus: version 8.2 only; 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 Workstation: version 7.0 only
• Samba Samba: from 4.0.0, 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.