CVE-2021-20208: Fedoraproject Fedora

Medium severity, CVSS 6.1. EPSS: 0.7% chance of exploitation in the next 30 days.

A flaw was found in cifs-utils in versions before 6.13. A user when mounting a krb5 CIFS file system from within a container can use Kerberos credentials of the host. The highest threat from this vulnerability is to data confidentiality and integrity.

Affected products

• Fedoraproject Fedora: version 33 only; version 34 only; version 35 only
• Red Hat Enterprise Linux: version 7.0 only; version 8.0 only
• Samba Cifs-Utils: from 4.0, before 6.13 (fixed in 6.13)

Published 2021-04-19. Last modified 2026-06-17.